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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2020	Apr. 30, 2020
Document and Entity Information [Abstract]
Title of 12(b) Security	Common stock, $0.001 par value per share
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	QUALYS, INC.
Entity Address, Address Line One	919 E. Hillsdale Boulevard, 4th Floor
City Area Code	650
Local Phone Number	801-6100
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Central Index Key	0001107843
Document Type	10-Q
Entity File Number	001-35662
Document Period End Date	Mar. 31, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		38,958,981
Entity Tax Identification Number	77-0534145
Trading Symbol	QLYS
Security Exchange Name	NASDAQ
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Address, City or Town	Foster City
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94404

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 147,565	$ 87,559
Short-term marketable securities	184,387	211,331
Accounts receivable, net of allowance of $640 and $585 as of March 31, 2020 and December 31, 2019, respectively	72,696	78,034
Prepaid expenses and other current assets	20,490	18,692
Total current assets	425,138	395,616
Long-term marketable securities	102,777	119,508
Property and equipment, net	61,665	60,579
Operating Lease, Right-of-Use Asset	38,760	40,551
Deferred tax assets, net	16,930	18,830
Intangible assets, net	15,275	16,795
Goodwill	7,447	7,447
Restricted cash	1,200	1,200
Other noncurrent assets	15,300	15,082
Total assets	684,492	675,608
Current liabilities:
Accounts payable	653	848
Accrued liabilities	23,753	22,784
Deferred revenues, current	201,861	192,172
Finance Lease, Liability, Current	7,968	7,663
Operating Lease, Liability, Noncurrent	41,486	44,015
Total current liabilities	234,235	223,467
Deferred revenues, noncurrent	21,823	20,935
Other noncurrent liabilities	218	388
Total liabilities	297,762	288,805
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at March 31, 2020 and December 31, 2019	0	0
Common stock, $0.001 par value; 1,000,000,000 shares authorized; 39,024,673 and 39,146,272 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	39	39
Additional paid-in capital	368,016	362,408
Accumulated other comprehensive income (loss)	1,553	1,162
Retained earnings	17,122	23,194
Total stockholders’ equity	386,730	386,803
Total liabilities and stockholders’ equity	$ 684,492	$ 675,608

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance at Dec. 31, 2018	$ 357,989	$ 39	$ 330,572	$ (586)	$ 27,964
Balance (in shares) at Dec. 31, 2018		39,015,034
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,266				13,266
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	896			896
Change in unrealized loss on investments	683
Issuance of common stock upon exercise of stock options	4,047		4,047
Issuance of common stock upon exercise of stock options (shares)		152,164
Stock Repurchased During Period, Shares		(94,090)
Treasury Stock, Value, Acquired, Cost Method	(7,871)		(1,129)		(6,742)
Adjustment To Additional Paid In Capital, Share-Based Compensation, Taxes Related To Net Share Settlements Of Equity Awards		(38,877)
Issuance of common stock upon vesting of restricted stock units (in shares)		99,601
Taxes from release of the restricted share units	(3,367)		(3,367)
Stock-based compensation	8,443		8,443
Ending balance at Mar. 31, 2019	373,403	$ 39	338,566	310	34,488
Balance (in shares) at Mar. 31, 2019		39,133,832
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained Earnings (Accumulated Deficit)	23,194
Beginning balance at Dec. 31, 2019	386,803	$ 39	362,408	1,162	23,194
Balance (in shares) at Dec. 31, 2019		39,146,272
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,694				18,694
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	391			391
Change in unrealized loss on investments	266
Issuance of common stock upon exercise of stock options	$ 4,714		4,714
Issuance of common stock upon exercise of stock options (shares)	144,989	144,989
Stock Repurchased During Period, Shares		(346,250)
Treasury Stock, Value, Acquired, Cost Method	$ (28,926)		(4,160)		(24,766)
Adjustment To Additional Paid In Capital, Share-Based Compensation, Taxes Related To Net Share Settlements Of Equity Awards		(58,598)
Issuance of common stock upon vesting of restricted stock units (in shares)		138,260
Taxes from release of the restricted share units	(5,000)		(5,000)
Stock-based compensation	10,054		10,054
Ending balance at Mar. 31, 2020	386,730	$ 39	$ 368,016	$ 1,553	$ 17,122
Balance (in shares) at Mar. 31, 2020		39,024,673
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained Earnings (Accumulated Deficit)	$ 17,122

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 640	$ 585
Preferred stock, par or stated value per share (USD per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par or stated value per share (USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	39,024,673	39,146,272
Common stock, shares outstanding	39,024,673	39,146,272

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Restricted cash	$ 1,200
Revenues
Revenues	86,263	$ 75,343
Cost of revenues	18,495	17,709
Gross profit	67,768	57,634
Operating expenses:
Research and development	17,983	15,837
Sales and marketing	18,230	17,315
General and administrative	11,124	10,431
Total operating expenses	47,337	43,583
Income from operations	20,431	14,051
Other income (expense), net:
Interest expense	(3)	(42)
Interest income	1,924	2,051
Other expense, net	(135)	(223)
Total other income, net	1,786	1,786
Income before income taxes	22,217	15,837
Provision for income taxes	3,523	2,571
Net income	$ 18,694	$ 13,266
Net income per share:
Basic (USD per share)	$ 0.48	$ 0.34
Diluted (USD per share)	$ 0.46	$ 0.32
Weighted average shares used in computing net income per share:
Basic (shares)	39,112	39,109
Diluted (shares)	40,846	41,546

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	$ 18,694	$ 13,266
Other comprehensive income, net of tax	391	896
Comprehensive income	19,085	14,162
Available-for-sale debt securities:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in net unrealized gain (loss)	351	655
Reclassification adjustment	(85)	28
Other comprehensive income, net of tax	266	683
Cash flow hedges:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in net unrealized gain (loss)	316	203
Reclassification adjustment	(191)	10
Other comprehensive income, net of tax	$ 125	$ 213

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Consolidated Statements of Comprehensive Income - Parenthetical - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax	$ (104)	$ (83)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	25	(2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(94)	(48)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ 57	$ (3)

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 18,694		$ 13,266
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	7,747		7,935
Accounts Receivable, Credit Loss Expense (Reversal)	0		105
Bad debt expense	148		0
Stock-based compensation	9,997		8,445
Amortization of accretion of discounts on marketable securities	(64)		(580)
Deferred income taxes	1,784		1,643
Changes in operating assets and liabilities:
Accounts receivable	5,190		7,962
Prepaid expenses and other assets	(1,629)		(3,205)
Accounts payable	(262)		(1,374)
Accrued liabilities	253		332
Deferred revenues	10,577		9,855
Other non-current liabilities	0		(37)
Net cash provided by operating activities	52,435		44,347
Cash flows from investing activities:
Purchases of marketable securities	(85,567)		(66,224)
Sales and maturities of marketable securities	129,651		91,046
Purchases of property and equipment	(7,271)		(8,608)
Business combinations	0		(850)
Payments to Acquire Investments		$ 600
Net cash provided by investing activities	36,813		15,364
Cash flows from financing activities:
Proceeds from exercise of stock options	4,714		4,047
Payments for taxes related to net share settlement of equity awards	(5,000)		(3,367)
Principal payments under finance lease obligations	(30)		(419)
Repurchase of common stock	(28,926)		(7,871)
Net cash used in financing activities	(29,242)		(7,610)
Net increase in cash, cash equivalents and restricted cash	60,006		52,101
Cash, cash equivalents and restricted cash at beginning of period	88,759	$ 94,327	42,226
Cash, cash equivalents and restricted cash at end of period	$ 148,765		$ 94,327

The Company and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
The Company and Summary of Significant Accounting Policies	The Company and Summary of Significant Accounting Policies Description of Business Qualys, Inc. (the “Company”, "we", "us", "our") was incorporated in the state of Delaware on December 30, 1999. The Company is headquartered in Foster City, California and has wholly-owned subsidiaries throughout the world. The Company is a pioneer and leading provider of cloud-based IT, security and compliance solutions that enable organizations to identify security risks to their IT infrastructures, help protect their IT systems and applications from ever-evolving cyber-attacks and achieve compliance with internal policies and external regulations. The Company’s cloud solutions address the growing security and compliance complexities and risks that are amplified by the dissolving boundaries between internal and external IT infrastructures and web environments, the rapid adoption of cloud computing and the proliferation of geographically dispersed IT assets. Organizations can use the Company’s integrated suite of solutions delivered on its Qualys Cloud Platform to cost-effectively obtain a unified view of their security and compliance posture across globally distributed IT infrastructures. Basis of Presentation The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information as well as the instructions to Form 10-Q and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). Certain information and disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet as of December 31, 2019, included herein, was derived from the audited financial statements as of that date but does not include all disclosures, including notes required by U.S. GAAP. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of the financial position, results of operations and cash flows for the interim periods. The results of operations for the three months ended March 31, 2020 are not necessarily indicative of the results of operations expected for the entire year ending December 31, 2020 or for any other future annual or interim periods. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on February 21, 2020. Risks and Uncertainties In March 2020, the World Health Organization declared the outbreak of a novel strain of coronavirus (“COVID-19”) as a pandemic. As a result of COVID-19, the Company has modified certain aspects of our business, including restricting employee travel, requiring employees to work from home, and canceling certain events and meetings, among other modifications. The Company will continue to actively monitor the situation and may take further actions that alter its business operations as may be required by federal, state or local authorities or that the Company determines are in the best interests of its employees, customers, partners, suppliers and stockholders. While the Company has not incurred significant disruptions from the COVID-19 outbreak, the Company is unable to accurately predict the full impact that COVID-19 will have due to numerous uncertainties, including the duration of the outbreak, actions that may be taken by governmental authorities and the impact to the business of its customers and partners. The Company will continue to evaluate the nature and extent of the impact to its business, financial position, results of operations and cash flows. Use of Estimates The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the consolidated financial statements and the reported results of operations during the reporting period. The Company’s management regularly assesses these estimates, which primarily affect revenue recognition, the valuation of accounts receivable, goodwill and intangible assets, capitalization of internally developed software, stock-based compensation and the provision for income taxes. Actual results could differ from those estimates and such differences may be material to the accompanying unaudited condensed consolidated financial statements. Derivative Financial Instruments Derivative financial instruments are utilized by the Company to reduce foreign currency exchange risks. The Company uses foreign currency forward contracts to mitigate the impact of foreign currency fluctuations of certain non-U.S. dollar denominated net asset positions, to date primarily cash, accounts receivable and operating lease liabilities (non-designated forward contracts), as well as to manage foreign currency fluctuation risk related to forecasted transactions (designated cash flow hedges). Open contracts are recorded within prepaid expenses and other current assets, other noncurrent assets, accrued liabilities or other noncurrent liabilities in the condensed consolidated balance sheets. Gains and losses resulting from currency exchange rate movements on non-designated forward contracts are recognized in other income (expense), net. Any gains or losses from derivatives designated as cash flow hedges are first recorded within accumulated other comprehensive income ("AOCI") and then reclassified to revenue or operating expenses when the hedged item impacts the condensed consolidated statements of operations. Stock-Based Compensation The Company recognizes the fair value of its employee stock options and restricted stock units over the requisite service periods for those awards ultimately expected to vest. The fair value of each option is estimated on the date of grant using the Black-Scholes-Merton option pricing model and the fair value of each restricted stock unit ("RSU") is based on the price of the Company's stock on the date of grant. Forfeitures are estimated on the date of grant and revised if actual or expected forfeiture activity differs materially from original estimates. The Company has issued performance-based awards and stock options, and accounts for these awards and options as stock-based compensation with multiple performance conditions. For these performance-based awards, the Company records compensation expense for only the performance milestones that are probable of being achieved, with such expense recorded on a straight-line basis over the expected vesting period. The Company reassesses performance-based estimates each reporting period and if there are any changes in the probability of achievement, the Company recognizes the cumulative effect in the period when the estimate changes. Non-marketable securities During the fiscal year ended December 31, 2018, the Company invested $2.5 million in preferred stock of a privately-held company. The fair value of the investment is not readily available, and there are no quoted market prices for the investment. The investment is included in other noncurrent assets on the consolidated balance sheets and measured at cost less impairment, adjusted for observable price changes. The investment is assessed for impairment annually or whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. As of March 31, 2020 and December 31, 2019, no impairment was recorded for the investment. During the second quarter ended June 30, 2019, the Company made an advance payment of $0.6 million to the investee for certain development work, which is recorded in other noncurrent assets on the condensed consolidated balance sheet. During the third quarter ended September 30, 2019, the Company made an additional investment of $0.6 million in a convertible security issued by this investee and recorded it in other current assets on the condensed consolidated balance sheet. Recently Adopted Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This ASU aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs related to internal-use software. It also requires the Company to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The Company adopted this ASU prospectively to applicable implementation costs incurred since January 1, 2020. Applicable implementation costs capitalized during the three months ended March 31, 2020 were not material. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326) as modified by subsequently issued ASU No. 2018-19, 2019-04 and 2019-05, which introduces a new accounting model, Current Expected Credit Losses (CECL). CECL requires earlier recognition of credit losses, while also providing additional transparency about credit risk. CECL utilizes a lifetime expected credit loss measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted each period for changes in expected lifetime credit losses. The Company adopted this ASU on January 1, 2020, using a modified retrospective transition method, which requires a cumulative-effect adjustment, if any, to the opening balance of retained earnings to be recognized on the date of adoption with prior periods not restated. The adoption did not have a material impact on the Company's consolidated financial statements. Recently Issued Accounting Pronouncements Not Yet Adopted In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) (ASU 2020-01). This ASU clarifies the interaction of the accounting for equity securities under Topic 321, the accounting for equity method investments in Topic 323, and the accounting for certain forward contracts and purchased options in Topic 815. It is effective for the Company beginning in the first quarter of fiscal 2021, and earlier adoption is permitted. The Company is currently evaluating the impact of its pending adoption of ASU 2020-01 on the Company's consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (ASU 2019-12), which simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. ASU 2019-12 is effective for the Company for fiscal years beginning after December 15, 2020. Most amendments within the standard are required to be applied on a prospective basis, while certain amendments must be applied on a retrospective or modified retrospective basis. The Company is currently evaluating the impacts of the provisions of ASU 2019-12 on its consolidated financial statements.

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For certain of the Company’s financial instruments, including certain cash equivalents, accounts receivable, accounts payable and other current liabilities, the carrying amounts approximate their fair values due to the relatively short maturity of these balances.

The Company measures and reports certain cash equivalents, marketable securities, derivative foreign currency forward contracts and commitments associated with prior business combinations at fair value in accordance with the provisions of the authoritative accounting guidance that addresses fair value measurements. This guidance establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. The hierarchy is broken down into three levels based on the reliability of inputs as follows:

Level 1-Valuations based on quoted prices in active markets for identical assets or liabilities.

Level 2-Valuations based on other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3-Valuations based on inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability.

The Company's Level 1 assets include a highly liquid money market funds, which are valued using unadjusted quoted prices that are available in an active market for an identical asset. Level 2 assets include fixed-income U.S. government agency securities, commercial paper, corporate bonds, asset-backed securities and derivative financial instruments consisting of foreign currency forward contracts. The securities, bonds and commercial paper are valued using prices from independent pricing services based on quoted prices in active markets for similar instruments or on industry models using data inputs such as interest rates and prices that can be directly observed or corroborated in active markets. The foreign currency forward contracts are valued using observable inputs, such as quotations on forward foreign exchange points and foreign interest rates. During the fiscal year ended December 31, 2019 and 2018, the Company made investments of $0.6 million in a convertible security and $2.5 million in preferred stock, respectively, issued by a privately-held company. The estimated fair value of the investments was determined based on Level 3 inputs. As of March 31, 2020 and December 31, 2019, management estimated that the fair value of the investments equaled their carrying value.

The Company's cash and cash equivalents, and marketable securities consist of the following:



	March 31, 2020
	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
	(in thousands)
Cash and cash equivalents:
Cash	$	94,365	$	—	$	—		$	94,365
Money market funds	35,033		—		—			35,033
U.S. government agencies	15,439		10		—			15,449
Commercial paper	1,200		—		—			1,200
Corporate bonds	1,517		1		—			1,518
Total	147,554		11		—			147,565
Short-term marketable securities:
Commercial paper	1,000		—		—			1,000
Corporate bonds	23,975		17		(84		)	23,908
Asset-backed securities	3,017		9		—			3,026
U.S. government agencies	155,316		1,137		—			156,453
Total	183,308		1,163		(84		)	184,387
Long-term marketable securities:
Asset-backed securities	39,983		79		(72		)	39,990
U.S. government agencies	16,409		544		(10		)	16,943
Corporate bonds	46,065		169		(390		)	45,844
Total	102,457		792		(472		)	102,777
Total	$	433,319	$	1,966	$	(556	)	$	434,729



	December 31, 2019
	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
	(in thousands)
Cash and cash equivalents:
Cash	$	84,102	$	—	$	—		$	84,102
Money market funds	58		—		—			58
Commercial paper	3,399		—		—			3,399
Total	87,559		—		—			87,559
Short-term marketable securities:
Commercial paper	2,239		—		—			2,239
Corporate bonds	33,048		51		(1		)	33,098
Asset-backed securities	2,438		11		—			2,449
U.S. government agencies	173,364		184		(3		)	173,545
Total	211,089		246		(4		)	211,331
Long-term marketable securities:
Asset-backed securities	40,001		193		(1		)	40,193
U.S. government agencies	46,447		370		—			46,817
Corporate bonds	32,236		262		—			32,498
Total	118,684		825		(1		)	119,508
Total	$	417,332	$	1,071	$	(5	)	$	418,398

There were no marketable securities that had been in a continuous unrealized loss position for 12 months or longer. As of March 31, 2020, the Company had the ability and intent to hold all marketable securities that were in an unrealized loss position until maturity or recovery. The Company considered the extent to which fair value was less than amortized cost basis and conditions related to security’s industry and geography and changes to the ratings, if any, and concluded the decline in fair value compared to carrying value was not related to credit loss.

The following table sets forth by level within the fair value hierarchy the fair value of the Company's cash equivalents and marketable securities measured on a recurring basis:



	March 31, 2020
	Level 1		Level 2		Fair Value
	(in thousands)
Money market funds	$	35,033	$	—	$	35,033
Commercial paper	—		2,200		2,200
U.S. government agencies	—		188,844		188,844
Corporate bonds	—		71,271		71,271
Asset-backed securities	—		43,016		43,016
Total	$	35,033	$	305,331	$	340,364



	December 31, 2019
	Level 1		Level 2		Fair Value
	(in thousands)
Money market funds	$	58	$	—	$	58
Commercial paper	—		5,638		5,638
U.S. government agencies	—		220,362		220,362
Corporate bonds	—		65,596		65,596
Asset-backed securities	—		42,642		42,642
Total	$	58	$	334,238	$	334,296

There were no transfers between Level 1 and Level 2 of the fair value hierarchy, as determined at the end of each reporting period.

The following summarizes the fair value of marketable securities by contractual or effective maturity as of March 31, 2020 and December 31, 2019:



	March 31, 2020
	Mature within One Year		Mature after One Year through Two Years		Mature over Two Years		Fair Value
	(in thousands)
Commercial paper	$	2,200	$	—	$	—	$	2,200
U.S. government agencies	171,901		15,712		1,231		188,844
Corporate bonds	25,428		24,156		21,687		71,271
Asset-backed securities	27,041		15,975		—		43,016
Total	$	226,570	$	55,843	$	22,918	$	305,331



	December 31, 2019
	Mature within One Year		Mature after One Year through Two Years		Mature over Two Years		Fair Value
	(in thousands)
Commercial paper	$	5,638	$	—	$	—	$	5,638
U.S. government agencies	173,546		46,816		—		220,362
Corporate bonds	33,098		23,251		9,247		65,596
Asset-backed securities	2,449		15,550		24,643		42,642
Total	$	214,731	$	85,617	$	33,890	$	334,238

Derivative Financial Instruments

Designated cash flow hedges

The Company uses a hedging strategy to reduce its exposure to foreign currency exchange rate fluctuations for forecasted subscription renewals and new orders in British Pound ("GBP") and Euro. The Company uses forward currency contracts accounted for as cash flow hedges against a designated portion of forecasted subscription renewals and new orders. Unrealized foreign exchange gains or losses related to those designated cash flow hedge contracts are recorded in AOCI and will be reclassified into revenue when the respective hedged transactions affect earnings.

In addition, the Company uses a hedging strategy to reduce its exposure associated with costs incurred in Indian Rupee ("INR"). Unrealized foreign exchange gains or losses related to those designated cash flow hedge contracts are recorded in AOCI and will be reclassified into operating expenses when the associated hedged costs are incurred.

At March 31, 2020, the Company had 39 open designated cash flow hedge contracts with notional amounts of €22.3 million, £9.4 million and Rs.1,560 million. At December 31, 2019, the Company had 26 open designated cash flow hedge contracts with notional amounts of €24.2 million and £9.7 million.



	Three Months Ended March 31,
Derivative instruments designated as cash flow hedges:	2020			2019
Net unrealized gains (before tax) recognized in AOCI:	(in thousands)
Foreign currency forward contracts (GBP, Euro and INR)	$	410		$	251

Net unrealized (gains) losses (before tax) reclassified from AOCI into income:
Foreign currency forward contracts (GBP and Euro)	(248		)	13
Net change in AOCI before tax	162			264
Net tax impact on the change in AOCI	(37		)	(51		)
Net change in AOCI after tax	$	125		$	213

As of March 31, 2020, the net amount of unrealized gains and losses on the foreign currency forward contracts for GBP and Euro reported in AOCI that is expected to be reclassified into revenue within the next 12 months is a gain of $1.2 million (before tax). As of March 31, 2020, the net amount of unrealized gains and losses on the foreign currency

forward contracts for INR reported in AOCI that is expected to be reclassified into operating expenses is a loss of $1.0 million (before tax).

Non-designated forward contracts

At March 31, 2020, the Company had 13 outstanding non-designated forward contracts with notional amounts of €13.1 million, £6.2 million and Rs.443.4 million. At December 31, 2019, the Company had 15 outstanding non-designated forward contracts with notional amounts of €20.0 million, £5.6 million and Rs.756.0 million.

The following summarizes derivative financial instruments as of March 31, 2020 and December 31, 2019:



	March 31,			December 31,
	2020			2019
Assets:	(in thousands)
Foreign currency forward contracts designated as cash flow hedge	$	954		$	427
Foreign currency forward contracts not designated as hedging instruments	516			515
Total	$	1,470		$	942
Liabilities:
Foreign currency forward contracts designated as cash flow hedge	$	(1,059	)	$	(524	)
Foreign currency forward contracts not designated as hedging instruments	(280		)	(550		)
Total	$	(1,339	)	$	(1,074	)

All foreign currency forward contracts were valued at fair value using level 2 inputs.

The following summarizes the gains (losses) recognized from forward contracts and other foreign currency transactions in other income (expense), net on the condensed consolidated statement of operations:



	Three Months Ended March 31,
	2020			2019
	(in thousands)
Net gain from non-designated forward contracts	$	804		$	23
Other foreign currency transactions loss	(871		)	(183		)
Total foreign exchange loss, net	(67		)	(160		)
Other expenses	(68		)	(63		)
Other expense, net	$	(135	)	$	(223	)

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Property and Equipment, Net

3 Months Ended

Mar. 31, 2020

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

Property and equipment, net, which includes assets under finance lease, consists of the following:



	March 31,			December 31,
	2020			2019
	(in thousands)
Computer equipment	$	116,810		$	112,599
Computer software	26,154			26,137
Furniture, fixtures and equipment	8,133			6,973
Finance leases - right of use asset	3,503			3,503
Scanner appliances	16,207			15,864
Leasehold improvements	20,302			18,817
Total property and equipment	191,109			183,893
Less: accumulated depreciation and amortization	(129,444		)	(123,314		)
Property and equipment, net	$	61,665		$	60,579

Physical scanner appliances and other computer equipment had a net carrying value of $4.4 million and $4.9 million at March 31, 2020 and December 31, 2019, respectively, including assets that had not been placed in service of $0.8 million and $0.9 million, respectively. Depreciation and amortization expense relating to property and equipment, including assets under finance leases, was $6.1 million and $6.4 million for the three months ended March 31, 2020 and 2019, respectively.

Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

The Company's subscription contracts are typically satisfied ratably over the subscription term as its cloud-based offerings are delivered to customers electronically and over time. In addition, the Company recognizes revenues for certain limited scan arrangements on an as-used basis. The Company recognizes revenue related to professional services based on time and materials or completion of milestones stated in the contracts.

As the vast majority of the Company’s offerings are subscription based, the Company rarely needs to allocate the transaction price to separate performance obligations. In the rare case that allocation of the transaction price is needed, the Company recognizes revenue in proportion to the standalone selling prices (SSP) of the underlying services at contract inception. If an SSP is not directly observable, the Company determines the SSP using information that may include market conditions and other observable inputs. The Company's transaction prices typically do not include variable consideration and are a fixed amount for a specific period of time, and the majority of contracts are twelve months with certain customers signing longer term deals. In general, the Company does not offer rights of return, performance bonuses, customer loyalty programs, payments via non-cash methods, refunds, volume rebates, incentive payments, penalties, price concessions or payments or discounts contingent on future events and the Company does not grant its customers any material rights. For contracts that include leased scanners and PCPs, the Company applies the lease and non-lease component practical expedient under ASC 842 to account for non-lease components and lease components as combined components under the revenue recognition guidance in ASU 2014-09, "Revenue from Contracts with Customers" (Topic 606) as the subscriptions are the predominant components in the arrangements.

Costs of shipping and handling charges associated with physical scanner appliances and other computer equipment are included in cost of revenues. Sales taxes and other taxes collected from customers to be remitted to government authorities are excluded from revenues.

Incremental direct costs of obtaining a contract, which consist of sales commissions primarily for new business and upsells, are deferred and amortized over the estimated life of the customer relationship if renewals are expected and the renewal commission is not commensurate with the initial commission. The Company elected the practical expedient to expense commissions on renewals where the specific anticipated contract term amortization period is one year or less. The Company amortizes the capitalized commission cost as a selling expense on a straight-line basis over a period of five years. The Company classifies deferred commissions as current or noncurrent based on the timing of when it expects to recognize the expense. The current and noncurrent portions of deferred commissions are included in prepaid expenses and other current assets and other noncurrent assets, respectively, in its condensed consolidated balance sheets.

Capitalized costs to obtain contracts, current and noncurrent are as follows (in thousands):



	March 31, 2020		December 31, 2019
Commission asset, current	$	2,789	$	2,568
Commission asset, noncurrent	$	6,629	$	6,454

For the three months ended March 31, 2020 and 2019, the Company recognized $0.7 million and $0.4 million, respectively, of commission expense from amortization of its commission assets. During the same periods, there was no impairment loss related to capitalized costs.

The Company records deferred revenue when cash payments are received or due in advance of its performance offset by revenue recognized in the period. Revenue of $73.8 million and $64.2 million was recognized during the three months ended March 31, 2020 and 2019, respectively, which amounts were included in the deferred revenue balances as of December 31, 2019 and 2018, respectively.

The Company's payment terms vary by the type and location of its customer and the products or services offered. For certain products or services and customer types, the Company requires payment before the products or services are delivered to the customer.

The following table sets forth the expected revenue from all remaining performance obligations as of March 31, 2020 (in thousands):



	Total Expected Revenue
2020 (remaining nine months)	$	61,692
2021	48,049
2022	22,146
2023	3,286
2024	456
2025 and thereafter	151
Total	$	135,780

Revenues allocated to remaining performance obligations represents contracted revenues that have not yet been recognized, which include deferred revenue and the amounts that will be invoiced and recognized as revenues in future periods from open contracts. Remaining performance obligations represent the transaction price of noncancelable orders for which service has not been performed and excludes unexercised renewals. The Company applied the short-term contract exemption to exclude the remaining performance obligations that are part of a contract that has an original expected duration of one year or less.

From time to time, the Company enters into contracts with customers that extend beyond one year, with certain of its customers electing to pay for more than one year of services upon contract execution. For any discounts associated with these multiple year contracts, the Company concluded its contracts did not contain a financing component.

Revenues by sales channel are as follows (in thousands):



	Three Months Ended
	March 31,
	2020		2019
Direct	$	50,005	$	43,039
Partner	36,258		32,304
Total	$	86,263	$	75,343

The Company utilizes partners to enable and accelerate the adoption of its cloud platform by increasing its distribution capabilities and market awareness of its cloud platform as well as by targeting geographic regions outside the reach of its direct sales force. The Company's channel partners maintain relationships with their customers throughout the territories in which they operate and provide their customers with services and third-party solutions to help meet those customers’ evolving security and compliance requirements. As such, these partners may offer the Company's IT, security and compliance solutions in conjunction with one or more of their own products or services and act as a conduit through which the Company can connect with these prospective customers to offer its solutions. For sales involving a channel partner, the channel partner engages with the prospective customer directly and involves the Company's sales team as needed to assist in developing and closing an order. When a channel partner secures a sale, the Company sells the associated subscription to the channel partner who in turn resells the subscription to the customer. Sales to channel partners are made at a discount and revenues are recorded at this discounted price over the subscription terms. The Company does not have any influence or specific knowledge of its partners' selling terms with their customers. See Note 13, "Segment Information and Information about Geographic Area" for disaggregation of revenue by geographic area.

Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Notes)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (loss)

The components and changes in accumulated other comprehensive income (loss), net of taxes, for the three months ended March 31, 2020 and 2019 were as follows (in thousands):



	Unrealized gains (losses) on AFS debt securities			Unrealized gains (losses) on cash flow hedges			Total
Balances as of December 31, 2019	$	822		$	340		$	1,162
Other comprehensive income before reclassification	351			316			667
Reclassification of gains from Other comprehensive income (loss)	(85		)	(191		)	(276		)
Total change in unrealized gain, net of tax	266			125			391
Balances as of March 31, 2020	$	1,088		$	465		$	1,553



	Unrealized gains (losses) on AFS debt securities			Unrealized gains (losses) on cash flow hedges			Total
Balances as of December 31, 2018	$	(545	)	$	(41	)	$	(586	)
Other comprehensive income before reclassification	655			203			858
Reclassification of losses from Other comprehensive income (loss)	28			10			38
Total change in unrealized gain, net of tax	683			213			896
Balances as of March 31, 2019	$	138		$	172		$	310

Business Combination Business Combination	3 Months Ended
Business Combination Business Combination	Mar. 31, 2020
Business Combinations [Abstract]
Business Combination	Business Combination On January 10, 2019, the Company acquired the assets of Adya, Inc. ("Adya"), an India-based company. The acquisition included a cloud application management platform, which enables security and compliance audits of SaaS applications. Total purchase consideration was $1.0 million, including $0.2 million of deferred consideration due eighteen months from the closing date of the acquisition, subject to potential adjustment from possible indemnity claims. Pro forma financial information for this acquisition has not been presented because it is not material to the Company's condensed consolidated financial statements. The Company accounted for this transaction as a business combination and allocated $0.9 million of the purchase price to technology-based intangible assets and $0.1 million to goodwill. The acquired intangible assets relating to Adya's developed technology are being amortized over the estimated useful lives of approximately four years. Goodwill arising from the Adya acquisition is deductible for tax purposes over 15 years.

Goodwill and Intangible Assets, Net

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, Net

ngible Assets, Net

Intangible assets consist primarily of developed technology and patent licenses from business combinations. Acquired intangibles are amortized on a straight-line basis over the respective estimated useful lives of the assets.

The carrying values of intangible assets are as follows (in thousands, except for years):



					March 31, 2020
	Weighted Average Life (Years)	Weighted Average Remaining Life (Years)	Cost		Accumulated Amortization			Net Book Value
Developed technology	4.6	2.5	$	26,356	$	(11,561	)	$	14,795
Patent licenses	14.0	4.4	1,387		(947		)	440
Total intangibles subject to amortization			$	27,743	$	(12,508	)	15,235
Intangible assets not subject to amortization								40
Total intangible assets, net								$	15,275

					December 31, 2019
	Weighted Average Life (Years)	Weighted Average Remaining Life (Years)	Cost		Accumulated Amortization			Net Book Value
Developed technology	4.6	2.7	$	26,356	$	(10,066	)	$	16,290
Patent Licenses	14.0	4.7	1,387		(922		)	465
Total intangibles subject to amortization			$	27,743	$	(10,988	)	16,755
Intangible assets not subject to amortization								40
Total intangible assets, net								$	16,795

Intangible asset amortization expense was $1.5 million for each of the three months ended March 31, 2020 and 2019.

As of March 31, 2020, the Company expects amortization expense in future periods to be as follows (in thousands):



	Amortization Expense
2020 (remaining nine months)	$	4,561
2021	6,081
2022	4,427
2023	100
2024	66
Total expected future amortization expense	$	15,235

Leases (Notes)

3 Months Ended

Mar. 31, 2020

Leases [Abstract]

Leases

On January 1, 2019, the Company adopted ASU No. 2016-02, “Leases (Topic 842),” which requires leases with durations greater than twelve months to be recognized on the balance sheet. We adopted the standard using the current period adjustment method with an effective date of January 1, 2019. Prior year financial statements were not restated under the new standard and, therefore, those amounts are not presented below. For both operating and finance leases, we recognize a right-of-use asset, which represents our right to use the underlying asset for the lease term, and a lease liability, which represents the present value of our obligation to make payments arising over the lease term. The present value of the lease payments is calculated using the incremental borrowing rate for operating and finance leases. The incremental borrowing rate is determined using a portfolio approach based on the rate of interest that the Company would have to pay to borrow an amount equal to the lease payments on a collateralized basis over a similar term.

Where the Company is the lessee, the Company elected to account for non-lease components associated with its leases (e.g., common area maintenance costs) and lease components separately for substantially all of its asset classes. In arrangements where the Company is the lessor, the Company elected to apply the practical expedient

which allows the Company to account for lease components (e.g., customer premise equipment) and non-lease components (e.g., service revenue) as combined components under the revenue recognition guidance in Topic 606 as service revenues are the predominant components in the arrangements.

The Company leases property and equipment under finance and operating leases. For leases with terms greater than 12 months, the Company records the related asset and obligation at the present value of lease payments over the term. Many of its leases include rental escalation clauses, renewal options and/or termination options that are factored into our determination of lease payments when appropriate.

When available, the Company uses the rate implicit in the lease to discount lease payments to present value; however, most of the leases do not provide a readily determinable implicit rate. Therefore, the Company must estimate an incremental borrowing rate to discount the lease payments based on information available at lease commencement.

The table below presents the lease-related assets and liabilities recorded on the balance sheet.



		March 31,		December 31,
(in thousands)	Classification on the Balance Sheet	2020		2019
Assets
Operating lease assets	Operating lease - right of use asset	$	38,760	$	40,551
Finance lease assets	Property and equipment, net	1,007		1,299
Total lease assets		$	39,767	$	41,850

Liabilities
Current
Operating	Operating lease liabilities, current	$	7,968	$	7,663
Finance	Accrued liabilities	148		124
Noncurrent
Operating	Operating lease liabilities, noncurrent	41,486		44,015
Finance	Other noncurrent liabilities	—		54
Total lease liabilities		$	49,602	$	51,856

The Company leases certain offices, computer equipment and its data center facilities under non-cancelable operating leases for varying periods through 2028. Lease expense was $4.4 million and $3.0 million for the three months ended March 31, 2020 and 2019, respectively.

Supplemental cash flow information related to leases was as follows (in thousands):



	Three Months Ended
	March 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	2,791
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	$	562

Operating and financing cash flows from finance leases were immaterial during the three months ended March 31, 2020.

The weighted average remaining lease term and the weighted average discount rate of the Company's leases were as follows:



	March 31, 2020
Weighted average remaining lease term (years)
Operating leases	6.3
Finance leases	0.8
Weighted average discount rates
Operating leases	5.0	%
Finance leases	5.0	%

Leases

The table below presents the lease-related assets and liabilities recorded on the balance sheet.



		March 31,		December 31,
(in thousands)	Classification on the Balance Sheet	2020		2019
Assets
Operating lease assets	Operating lease - right of use asset	$	38,760	$	40,551
Finance lease assets	Property and equipment, net	1,007		1,299
Total lease assets		$	39,767	$	41,850

Liabilities
Current
Operating	Operating lease liabilities, current	$	7,968	$	7,663
Finance	Accrued liabilities	148		124
Noncurrent
Operating	Operating lease liabilities, noncurrent	41,486		44,015
Finance	Other noncurrent liabilities	—		54
Total lease liabilities		$	49,602	$	51,856

Supplemental cash flow information related to leases was as follows (in thousands):



	Three Months Ended
	March 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	2,791
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	$	562

Operating and financing cash flows from finance leases were immaterial during the three months ended March 31, 2020.

The weighted average remaining lease term and the weighted average discount rate of the Company's leases were as follows:



	March 31, 2020
Weighted average remaining lease term (years)
Operating leases	6.3
Finance leases	0.8
Weighted average discount rates
Operating leases	5.0	%
Finance leases	5.0	%

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Indemnifications The Company from time to time enters into certain types of contracts that contingently require it to indemnify various parties against claims from third parties. These contracts primarily relate to (i) the Company's by-laws, under which it must indemnify directors and executive officers, and may indemnify other officers and employees, for liabilities arising out of their relationship, (ii) contracts under which the Company must indemnify directors and certain officers for liabilities arising out of their relationship, and (iii) contracts under which the Company may be required to indemnify customers or resellers from certain liabilities arising from potential infringement of intellectual property rights, as well as potential damages caused by limited product defects. To date, the Company has not incurred and has not recorded any liability in connection with such indemnifications. The Company maintains director and officer insurance, which may cover certain liabilities arising from its obligation to indemnify its directors.

Stock-based Compensation

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Stock-based Compensation

Stockholders' Equity and Stock-based Compensation

Equity Incentive Plans

2012 Equity Incentive Plan

Under the 2012 Equity Incentive Plan (the "2012 Plan"), the Company is authorized to grant to eligible participants incentive stock options (“ISOs”), non-statutory stock options (“NSOs”), stock appreciation rights ("SARs"), restricted stock awards ("RSAs"), restricted stock units ("RSUs"), performance units and performance shares equivalent to up to 15.7 million shares of common stock as of March 31, 2020. Options may be granted with an exercise price that is at least equal to the fair market value of the Company's stock at the date of grant and are exercisable when vested. As of March 31, 2020, 7.2 million shares were available for grant under the 2012 Plan.

2000 Equity Incentive Plan

Under the 2000 Equity Incentive Plan (the "2000 Plan"), the Company was authorized to grant to eligible participants either ISOs or NSOs. The 2000 Plan was terminated in connection with the closing of the Company's initial public offering, and accordingly, no shares are currently available for grant under the 2000 Plan. The 2000 Plan continues to govern outstanding awards granted thereunder.

Stock-based Compensation

The following table shows a summary of the stock-based compensation expense included in the condensed consolidated statements of operations for the three months ended March 31, 2020 and 2019:



	Three Months Ended
	March 31,
	2020		2019
	(in thousands)
Cost of revenues	$	614	$	545
Research and development	3,437		2,340
Sales and marketing	1,560		1,068
General and administrative	4,386		4,492
Total stock-based compensation	$	9,997	$	8,445

As of March 31, 2020, the Company had $14.9 million of total unrecognized stock-based compensation cost related to unvested options which was expected to be recognized over a weighted-average period of 2.2 years, and $60.5 million of unrecognized stock-based compensation cost related to unvested RSUs which was expected to be recognized over a weighted-average period of 2.5 years. Compensation cost is recognized over the service period. Forfeitures are estimated at the time of grant and revised in subsequent periods, if actual forfeitures differ from those estimates.

Stock Option Plan Activity

A summary of the Company’s stock option activity is as follows:



	Outstanding Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
						(in thousands)
Balance as of December 31, 2019	2,866,675		$	40.54	6.0	$	125,647
Granted	82,300		$	88.57
Exercised	(144,989	)	$	32.51
Canceled	(19,235	)	$	80.57
Balance as of March 31, 2020	2,784,751		$	42.11	6.2	$	126,495
Vested and expected to vest - March 31, 2020	2,620,436		$	39.53	6.0	$	125,595
Exercisable - March 31, 2020	2,073,385		$	29.22	5.3	$	120,221

Restricted Stock

A summary of the Company’s RSU activity is as follows:



	Outstanding RSUs		Weighted Average Grant Date Fair Value Per Share

Balance as of December 31, 2019	1,214,818		$	67.99
Granted	64,397		$	87.34
Vested	(138,260	)	$	59.51
Canceled	(23,348	)	$	69.61
Balance as of March 31, 2020	1,117,607		$	70.12
Outstanding and expected to vest - March 31, 2020	826,637		$	68.49

Performance-Based Stock Options and Restricted Stock Units

On November 2, 2019, the Compensation Committee of the Company's board of directors granted the equity award for 2020, which consisted of time-based RSUs and performance-based non-statutory stock options ("NSOs"), to the Company’s Chairman and Chief Executive Officer, Philippe Courtot. The Compensation Committee, in consultation with its independent compensation consultant, designed these awards so that greater than 50% of this compensation was based on the achievement of performance goals linked to metrics designed to drive the creation of shareholder value.

The first portion of the award consists of 48,683 time-based RSUs that will vest in quarterly installments beginning on December 1, 2019, assuming continued service through each applicable vesting date. The second portion of the award consists of 123,856 NSOs that will vest at the end of the performance period based on achievement of goals related to revenue growth and free cash flow per share growth during the three-year period from January 2020 through December 2022, generally conditioned on Mr. Courtot’s continued status as a service provider through the date that performance is certified. If Mr. Courtot’s employment (a) is terminated by reason of death or disability or (b) is terminated by the Company for reasons other than cause within 12 months following a change in control (a “double trigger” termination), then 100% of any unvested portions of the award will vest, with any vesting in connection with change in control terminations conditioned upon the effectiveness of a release of claims in favor of the Company (2019 performance-based NSOs).

On December 21, 2018, the Compensation Committee granted the equity award for 2019, which consisted of time-based and performance-based RSUs, to Mr. Courtot. The Compensation Committee, in consultation with its independent compensation consultant, designed these awards so that greater than 50% of this compensation was based on the achievement of performance goals linked to metrics designed to drive the creation of shareholder value.

The first portion of the award consists of 56,250 time-based RSUs that will vest in 16 quarterly increments beginning on January 1, 2019, assuming continued service through each applicable vesting date. The second portion of the award consists of 33,089 performance-based RSUs that will vest based on achievement of goals related to revenue growth for a three-year period from January 2019 through December 2021 and adjusted EBITDA margin for the 2021 fiscal year, generally conditioned on Mr. Courtot’s continued status as a service provider through the date that performance is certified. The third portion of the award consists of 33,088 performance-based RSUs that will vest in three increments based on the achievement of goals related to revenue growth and adjusted EBITDA margin for each of the 2019, 2020 and 2021 fiscal years, generally conditioned on Mr. Courtot’s continued status as a service provider through the date that performance is certified for the relevant increment. If Mr. Courtot’s employment (a) is terminated by reason of death or disability or (b) is terminated by the Company for reasons other than cause or good reason within 12 months following a change in control (a “double trigger” termination), then 100% of any unvested portions of the award will vest, with any vesting in connection with change in control terminations conditioned upon the effectiveness of a release of claims in favor of the Company (2018 performance-based RSUs).

During the three months ended March 31, 2020,14,864 shares, which represent 135% of the target number of 11,030 shares under the 2018 performance-based RSUs, vested as a result of the Company achieving the performance goals for fiscal 2019.

During each of the three months ended March 31, 2020 and 2019, stock-based compensation costs of $0.1 million and $0.2 million, respectively, were recognized for the 2019 performance-based NSOs and the 2018 performance-based RSUs.

Share Repurchase Program

On February 5, 2018, the Company's board of directors authorized a $100.0 million two-year share repurchase program, which was announced on February 12, 2018. On October 30, 2018, October 30, 2019 and May 7, 2020, the Company announced that its board of directors had authorized an increase of $100.0 million, $100.0 million and $100.0 million, respectively, to the original share repurchase program authorization, resulting in an aggregate authorization of $400.0 million. Shares may be repurchased from time to time on the open market in accordance with Rule 10b-18 of the Exchange Act of 1934, including pursuant to a pre-set trading plan adopted in accordance with Rule 10b5-1 under the Exchange Act ("Rule 10b5-1"), until April 28, 2022.

Repurchased shares are retired and reclassified as authorized and unissued shares of common stock. On retirement of the repurchased shares, common stock is reduced by an amount equal to the number of shares being retired multiplied by the par value. The excess amount that is retired over its par value is first allocated as a reduction to additional paid-in capital based on the initial public offering price of the stock, with the remaining excess to retained earnings.

During the three months ended March 31, 2020, the Company repurchased 346,250 shares of its common stock for approximately $28.9 million. All share repurchases were made using cash resources. As of March 31, 2020, approximately $99.6 million remained available for share repurchases pursuant to the Company's share repurchase program.

Net Income Per Share

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Net Income Per Share

The computations for basic and diluted net income per share are as follows:



	Three Months Ended
	March 31,
	2020		2019
	(in thousands, except per share data)
Numerator:
Net income	$	18,694	$	13,266
Denominator:
Weighted-average shares used in computing net income per share:
Basic	39,112		39,109
Effect of potentially dilutive securities:
Common stock options	1,423		1,970
Restricted stock units	311		467
Diluted	40,846		41,546
Net income per share:
Basic	$	0.48	$	0.34
Diluted	$	0.46	$	0.32

Potentially dilutive securities not included in the calculation of diluted net income per share because doing so would be anti-dilutive are as follows:



	Three Months Ended
	March 31,
	2020	2019
	(in thousands)
Common stock options	582	343
Restricted stock units	66	38
	648	381

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's provision for income taxes for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items, if any, that arise during the period. Each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual effective tax rate changes, the Company makes a cumulative adjustment in such period. The Company's quarterly tax provision, and estimate of its annual effective tax rate, is subject to variation due to several factors, including variability in pre-tax income (or loss), the mix of jurisdictions to which such income relates, changes in how the Company does business, and tax law developments. The Company's estimated effective tax rate for the year differs from the U.S. statutory rate of 21% primarily due to non-deductible stock-based compensation expense, state taxes, and the benefit of U.S. federal income tax credits and foreign-derived intangible income deduction. The Company recorded an income tax provision of $3.5 million and $2.6 million for the three months ended March 31, 2020 and 2019, respectively, resulting in an effective tax rate of 15.9% and 16.2%, respectively. The tax provision for the three months ended March 31, 2020 as compared to the tax provision for the three months ended March 31, 2019 changed primarily due to an increase in pre-tax income in the current period. As of March 31, 2020, the Company had unrecognized tax benefits of $8.1 million, of which $4.4 million, if recognized, would favorably impact the Company's effective tax rate. As of December 31, 2019, the Company had unrecognized tax benefits of $7.8 million, of which $4.2 million, if recognized, would favorably impact the Company's effective tax rate. The Company does not anticipate a material change in its unrecognized tax benefits in the next 12 months.

Segment Information and Information about Geographic Area

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Segment Information and Information about Geographic Area

The Company operates in one segment. The Company determines its reportable operating segments in accordance with the provisions in the FASB guidance on segment reporting, which establishes standards for, and requires disclosure of, certain financial information related to reportable operating segments and geographic regions. The Company’s chief operating decision maker is the Chairman and Chief Executive Officer, who makes operating decisions, assesses performance and allocates resources on a consolidated basis. The Company’s principal operating and decision-making functions are located in the United States.

Revenue by geographic area, based on the customer's billing address, is as follows:



	Three Months Ended
	March 31,
	2020		2019
	(in thousands)
United States	$	54,963	$	48,621
Foreign	31,300		26,722
Total	$	86,263	$	75,343

Property and equipment, net, by geographic area, is as follows:



	March 31,		December 31,
	2020		2019
	(in thousands)
United States	$	44,614	$	46,100
India	11,358		9,221
Foreign	5,693		5,258
Total property and equipment, net	$	61,665	$	60,579

The Company and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Description Of Business	Description of Business Qualys, Inc. (the “Company”, "we", "us", "our") was incorporated in the state of Delaware on December 30, 1999. The Company is headquartered in Foster City, California and has wholly-owned subsidiaries throughout the world. The Company is a pioneer and leading provider of cloud-based IT, security and compliance solutions that enable organizations to identify security risks to their IT infrastructures, help protect their IT systems and applications from ever-evolving cyber-attacks and achieve compliance with internal policies and external regulations. The Company’s cloud solutions address the growing security and compliance complexities and risks that are amplified by the dissolving boundaries between internal and external IT infrastructures and web environments, the rapid adoption of cloud computing and the proliferation of geographically dispersed IT assets. Organizations can use the Company’s integrated suite of solutions delivered on its Qualys Cloud Platform to cost-effectively obtain a unified view of their security and compliance posture across globally distributed IT infrastructures.
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information as well as the instructions to Form 10-Q and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). Certain information and disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet as of December 31, 2019, included herein, was derived from the audited financial statements as of that date but does not include all disclosures, including notes required by U.S. GAAP. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of the financial position, results of operations and cash flows for the interim periods. The results of operations for the three months ended March 31, 2020 are not necessarily indicative of the results of operations expected for the entire year ending December 31, 2020 or for any other future annual or interim periods. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on February 21, 2020. Risks and Uncertainties In March 2020, the World Health Organization declared the outbreak of a novel strain of coronavirus (“COVID-19”) as a pandemic. As a result of COVID-19, the Company has modified certain aspects of our business, including restricting employee travel, requiring employees to work from home, and canceling certain events and meetings, among other modifications. The Company will continue to actively monitor the situation and may take further actions that alter its business operations as may be required by federal, state or local authorities or that the Company determines are in the best interests of its employees, customers, partners, suppliers and stockholders. While the Company has not incurred significant disruptions from the COVID-19 outbreak, the Company is unable to accurately predict the full impact that COVID-19 will have due to numerous uncertainties, including the duration of the outbreak, actions that may be taken by governmental authorities and the impact to the business of its customers and partners. The Company will continue to evaluate the nature and extent of the impact to its business, financial position, results of operations and cash flows. Use of Estimates The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the consolidated financial statements and the reported results of operations during the reporting period. The Company’s management regularly assesses these estimates, which primarily affect revenue recognition, the valuation of accounts receivable, goodwill and intangible assets, capitalization of internally developed software, stock-based compensation and the provision for income taxes. Actual results could differ from those estimates and such differences may be material to the accompanying unaudited condensed consolidated financial statements. Derivative Financial Instruments Derivative financial instruments are utilized by the Company to reduce foreign currency exchange risks. The Company uses foreign currency forward contracts to mitigate the impact of foreign currency fluctuations of certain non-U.S. dollar denominated net asset positions, to date primarily cash, accounts receivable and operating lease liabilities (non-designated forward contracts), as well as to manage foreign currency fluctuation risk related to forecasted transactions (designated cash flow hedges). Open contracts are recorded within prepaid expenses and other current assets, other noncurrent assets, accrued liabilities or other noncurrent liabilities in the condensed consolidated balance sheets. Gains and losses resulting from currency exchange rate movements on non-designated forward contracts are recognized in other income (expense), net. Any gains or losses from derivatives designated as cash flow hedges are first recorded within accumulated other comprehensive income ("AOCI") and then reclassified to revenue or operating expenses when the hedged item impacts the condensed consolidated statements of operations. Stock-Based Compensation The Company recognizes the fair value of its employee stock options and restricted stock units over the requisite service periods for those awards ultimately expected to vest. The fair value of each option is estimated on the date of grant using the Black-Scholes-Merton option pricing model and the fair value of each restricted stock unit ("RSU") is based on the price of the Company's stock on the date of grant. Forfeitures are estimated on the date of grant and revised if actual or expected forfeiture activity differs materially from original estimates. The Company has issued performance-based awards and stock options, and accounts for these awards and options as stock-based compensation with multiple performance conditions. For these performance-based awards, the Company records compensation expense for only the performance milestones that are probable of being achieved, with such expense recorded on a straight-line basis over the expected vesting period. The Company reassesses performance-based estimates each reporting period and if there are any changes in the probability of achievement, the Company recognizes the cumulative effect in the period when the estimate changes. Non-marketable securities During the fiscal year ended December 31, 2018, the Company invested $2.5 million in preferred stock of a privately-held company. The fair value of the investment is not readily available, and there are no quoted market prices for the investment. The investment is included in other noncurrent assets on the consolidated balance sheets and measured at cost less impairment, adjusted for observable price changes. The investment is assessed for impairment annually or whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. As of March 31, 2020 and December 31, 2019, no impairment was recorded for the investment. During the second quarter ended June 30, 2019, the Company made an advance payment of $0.6 million to the investee for certain development work, which is recorded in other noncurrent assets on the condensed consolidated balance sheet. During the third quarter ended September 30, 2019, the Company made an additional investment of $0.6 million in a convertible security issued by this investee and recorded it in other current assets on the condensed consolidated balance sheet. Recently Adopted Accounting Pronouncements
Recently adopted Accounting Pronouncements and Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This ASU aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs related to internal-use software. It also requires the Company to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The Company adopted this ASU prospectively to applicable implementation costs incurred since January 1, 2020. Applicable implementation costs capitalized during the three months ended March 31, 2020 were not material. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326) as modified by subsequently issued ASU No. 2018-19, 2019-04 and 2019-05, which introduces a new accounting model, Current Expected Credit Losses (CECL). CECL requires earlier recognition of credit losses, while also providing additional transparency about credit risk. CECL utilizes a lifetime expected credit loss measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted each period for changes in expected lifetime credit losses. The Company adopted this ASU on January 1, 2020, using a modified retrospective transition method, which requires a cumulative-effect adjustment, if any, to the opening balance of retained earnings to be recognized on the date of adoption with prior periods not restated. The adoption did not have a material impact on the Company's consolidated financial statements. Recently Issued Accounting Pronouncements Not Yet Adopted In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) (ASU 2020-01). This ASU clarifies the interaction of the accounting for equity securities under Topic 321, the accounting for equity method investments in Topic 323, and the accounting for certain forward contracts and purchased options in Topic 815. It is effective for the Company beginning in the first quarter of fiscal 2021, and earlier adoption is permitted. The Company is currently evaluating the impact of its pending adoption of ASU 2020-01 on the Company's consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (ASU 2019-12), which simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. ASU 2019-12 is effective for the Company for fiscal years beginning after December 15, 2020. Most amendments within the standard are required to be applied on a prospective basis, while certain amendments must be applied on a retrospective or modified retrospective basis. The Company is currently evaluating the impacts of the provisions of ASU 2019-12 on its consolidated financial statements.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For certain of the Company’s financial instruments, including certain cash equivalents, accounts receivable, accounts payable and other current liabilities, the carrying amounts approximate their fair values due to the relatively short maturity of these balances. The Company measures and reports certain cash equivalents, marketable securities, derivative foreign currency forward contracts and commitments associated with prior business combinations at fair value in accordance with the provisions of the authoritative accounting guidance that addresses fair value measurements. This guidance establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. The hierarchy is broken down into three levels based on the reliability of inputs as follows: Level 1-Valuations based on quoted prices in active markets for identical assets or liabilities. Level 2-Valuations based on other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3-Valuations based on inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The Company's Level 1 assets include a highly liquid money market funds, which are valued using unadjusted quoted prices that are available in an active market for an identical asset. Level 2 assets include fixed-income U.S. government agency securities, commercial paper, corporate bonds, asset-backed securities and derivative financial instruments consisting of foreign currency forward contracts. The securities, bonds and commercial paper are valued using prices from independent pricing services based on quoted prices in active markets for similar instruments or on industry models using data inputs such as interest rates and prices that can be directly observed or corroborated in active markets. The foreign currency forward contracts are valued using observable inputs, such as quotations on forward foreign exchange points and foreign interest rates. During the fiscal year ended December 31, 2019 and 2018, the Company made investments of $0.6 million in a convertible security and $2.5 million in preferred stock, respectively, issued by a privately-held company. The estimated fair value of the investments was determined based on Level 3 inputs. As of March 31, 2020 and December 31, 2019, management estimated that the fair value of the investments equaled their carrying value.

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Derivative Instruments [Table Text Block]

The following summarizes derivative financial instruments as of March 31, 2020 and December 31, 2019:



	March 31,			December 31,
	2020			2019
Assets:	(in thousands)
Foreign currency forward contracts designated as cash flow hedge	$	954		$	427
Foreign currency forward contracts not designated as hedging instruments	516			515
Total	$	1,470		$	942
Liabilities:
Foreign currency forward contracts designated as cash flow hedge	$	(1,059	)	$	(524	)
Foreign currency forward contracts not designated as hedging instruments	(280		)	(550		)
Total	$	(1,339	)	$	(1,074	)

Schedule of Cash and Cash Equivalents, Available-for-sale Securities Reconciliation

The Company's cash and cash equivalents, and marketable securities consist of the following:



	March 31, 2020
	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
	(in thousands)
Cash and cash equivalents:
Cash	$	94,365	$	—	$	—		$	94,365
Money market funds	35,033		—		—			35,033
U.S. government agencies	15,439		10		—			15,449
Commercial paper	1,200		—		—			1,200
Corporate bonds	1,517		1		—			1,518
Total	147,554		11		—			147,565
Short-term marketable securities:
Commercial paper	1,000		—		—			1,000
Corporate bonds	23,975		17		(84		)	23,908
Asset-backed securities	3,017		9		—			3,026
U.S. government agencies	155,316		1,137		—			156,453
Total	183,308		1,163		(84		)	184,387
Long-term marketable securities:
Asset-backed securities	39,983		79		(72		)	39,990
U.S. government agencies	16,409		544		(10		)	16,943
Corporate bonds	46,065		169		(390		)	45,844
Total	102,457		792		(472		)	102,777
Total	$	433,319	$	1,966	$	(556	)	$	434,729



	December 31, 2019
	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
	(in thousands)
Cash and cash equivalents:
Cash	$	84,102	$	—	$	—		$	84,102
Money market funds	58		—		—			58
Commercial paper	3,399		—		—			3,399
Total	87,559		—		—			87,559
Short-term marketable securities:
Commercial paper	2,239		—		—			2,239
Corporate bonds	33,048		51		(1		)	33,098
Asset-backed securities	2,438		11		—			2,449
U.S. government agencies	173,364		184		(3		)	173,545
Total	211,089		246		(4		)	211,331
Long-term marketable securities:
Asset-backed securities	40,001		193		(1		)	40,193
U.S. government agencies	46,447		370		—			46,817
Corporate bonds	32,236		262		—			32,498
Total	118,684		825		(1		)	119,508
Total	$	417,332	$	1,071	$	(5	)	$	418,398

Schedule of changes to accumulated other comprehensive income

Accumulated Other Comprehensive Income (loss)

The components and changes in accumulated other comprehensive income (loss), net of taxes, for the three months ended March 31, 2020 and 2019 were as follows (in thousands):



	Unrealized gains (losses) on AFS debt securities			Unrealized gains (losses) on cash flow hedges			Total
Balances as of December 31, 2019	$	822		$	340		$	1,162
Other comprehensive income before reclassification	351			316			667
Reclassification of gains from Other comprehensive income (loss)	(85		)	(191		)	(276		)
Total change in unrealized gain, net of tax	266			125			391
Balances as of March 31, 2020	$	1,088		$	465		$	1,553



	Unrealized gains (losses) on AFS debt securities			Unrealized gains (losses) on cash flow hedges			Total
Balances as of December 31, 2018	$	(545	)	$	(41	)	$	(586	)
Other comprehensive income before reclassification	655			203			858
Reclassification of losses from Other comprehensive income (loss)	28			10			38
Total change in unrealized gain, net of tax	683			213			896
Balances as of March 31, 2019	$	138		$	172		$	310

Schedule of Assets Measured on Recurring Basis

The following table sets forth by level within the fair value hierarchy the fair value of the Company's cash equivalents and marketable securities measured on a recurring basis:



	March 31, 2020
	Level 1		Level 2		Fair Value
	(in thousands)
Money market funds	$	35,033	$	—	$	35,033
Commercial paper	—		2,200		2,200
U.S. government agencies	—		188,844		188,844
Corporate bonds	—		71,271		71,271
Asset-backed securities	—		43,016		43,016
Total	$	35,033	$	305,331	$	340,364



	December 31, 2019
	Level 1		Level 2		Fair Value
	(in thousands)
Money market funds	$	58	$	—	$	58
Commercial paper	—		5,638		5,638
U.S. government agencies	—		220,362		220,362
Corporate bonds	—		65,596		65,596
Asset-backed securities	—		42,642		42,642
Total	$	58	$	334,238	$	334,296

Schedule of Available-for-Sale Securities by Contractual Maturity

The following summarizes the fair value of marketable securities by contractual or effective maturity as of March 31, 2020 and December 31, 2019:



	March 31, 2020
	Mature within One Year		Mature after One Year through Two Years		Mature over Two Years		Fair Value
	(in thousands)
Commercial paper	$	2,200	$	—	$	—	$	2,200
U.S. government agencies	171,901		15,712		1,231		188,844
Corporate bonds	25,428		24,156		21,687		71,271
Asset-backed securities	27,041		15,975		—		43,016
Total	$	226,570	$	55,843	$	22,918	$	305,331



	December 31, 2019
	Mature within One Year		Mature after One Year through Two Years		Mature over Two Years		Fair Value
	(in thousands)
Commercial paper	$	5,638	$	—	$	—	$	5,638
U.S. government agencies	173,546		46,816		—		220,362
Corporate bonds	33,098		23,251		9,247		65,596
Asset-backed securities	2,449		15,550		24,643		42,642
Total	$	214,731	$	85,617	$	33,890	$	334,238

Summary of Gains (Losses) Recognized From Forward Contracts and Other Foreign Currency Transactions



	Three Months Ended March 31,
Derivative instruments designated as cash flow hedges:	2020			2019
Net unrealized gains (before tax) recognized in AOCI:	(in thousands)
Foreign currency forward contracts (GBP, Euro and INR)	$	410		$	251

Net unrealized (gains) losses (before tax) reclassified from AOCI into income:
Foreign currency forward contracts (GBP and Euro)	(248		)	13
Net change in AOCI before tax	162			264
Net tax impact on the change in AOCI	(37		)	(51		)
Net change in AOCI after tax	$	125		$	213



	Three Months Ended March 31,
	2020			2019
	(in thousands)
Net gain from non-designated forward contracts	$	804		$	23
Other foreign currency transactions loss	(871		)	(183		)
Total foreign exchange loss, net	(67		)	(160		)
Other expenses	(68		)	(63		)
Other expense, net	$	(135	)	$	(223	)

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

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+ Details

Property and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2020

Property, Plant and Equipment [Abstract]

Property and equipment, net

Property and equipment, net, which includes assets under finance lease, consists of the following:



	March 31,			December 31,
	2020			2019
	(in thousands)
Computer equipment	$	116,810		$	112,599
Computer software	26,154			26,137
Furniture, fixtures and equipment	8,133			6,973
Finance leases - right of use asset	3,503			3,503
Scanner appliances	16,207			15,864
Leasehold improvements	20,302			18,817
Total property and equipment	191,109			183,893
Less: accumulated depreciation and amortization	(129,444		)	(123,314		)
Property and equipment, net	$	61,665		$	60,579

Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Commission asset balances

Capitalized costs to obtain contracts, current and noncurrent are as follows (in thousands):



	March 31, 2020		December 31, 2019
Commission asset, current	$	2,789	$	2,568
Commission asset, noncurrent	$	6,629	$	6,454

Contract liabilities

Capitalized costs to obtain contracts, current and noncurrent are as follows (in thousands):



	March 31, 2020		December 31, 2019
Commission asset, current	$	2,789	$	2,568
Commission asset, noncurrent	$	6,629	$	6,454

Expected revenue from contracts

The following table sets forth the expected revenue from all remaining performance obligations as of March 31, 2020 (in thousands):



	Total Expected Revenue
2020 (remaining nine months)	$	61,692
2021	48,049
2022	22,146
2023	3,286
2024	456
2025 and thereafter	151
Total	$	135,780

Revenue by sales channel

Revenues by sales channel are as follows (in thousands):



	Three Months Ended
	March 31,
	2020		2019
Direct	$	50,005	$	43,039
Partner	36,258		32,304
Total	$	86,263	$	75,343

Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Schedule of changes to accumulated other comprehensive income

Accumulated Other Comprehensive Income (loss)

The components and changes in accumulated other comprehensive income (loss), net of taxes, for the three months ended March 31, 2020 and 2019 were as follows (in thousands):



	Unrealized gains (losses) on AFS debt securities			Unrealized gains (losses) on cash flow hedges			Total
Balances as of December 31, 2019	$	822		$	340		$	1,162
Other comprehensive income before reclassification	351			316			667
Reclassification of gains from Other comprehensive income (loss)	(85		)	(191		)	(276		)
Total change in unrealized gain, net of tax	266			125			391
Balances as of March 31, 2020	$	1,088		$	465		$	1,553



	Unrealized gains (losses) on AFS debt securities			Unrealized gains (losses) on cash flow hedges			Total
Balances as of December 31, 2018	$	(545	)	$	(41	)	$	(586	)
Other comprehensive income before reclassification	655			203			858
Reclassification of losses from Other comprehensive income (loss)	28			10			38
Total change in unrealized gain, net of tax	683			213			896
Balances as of March 31, 2019	$	138		$	172		$	310

Goodwill and Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying value of intangible assets

The carrying values of intangible assets are as follows (in thousands, except for years):



					March 31, 2020
	Weighted Average Life (Years)	Weighted Average Remaining Life (Years)	Cost		Accumulated Amortization			Net Book Value
Developed technology	4.6	2.5	$	26,356	$	(11,561	)	$	14,795
Patent licenses	14.0	4.4	1,387		(947		)	440
Total intangibles subject to amortization			$	27,743	$	(12,508	)	15,235
Intangible assets not subject to amortization								40
Total intangible assets, net								$	15,275

					December 31, 2019
	Weighted Average Life (Years)	Weighted Average Remaining Life (Years)	Cost		Accumulated Amortization			Net Book Value
Developed technology	4.6	2.7	$	26,356	$	(10,066	)	$	16,290
Patent Licenses	14.0	4.7	1,387		(922		)	465
Total intangibles subject to amortization			$	27,743	$	(10,988	)	16,755
Intangible assets not subject to amortization								40
Total intangible assets, net								$	16,795

Intangible assets future periods amortization expense

As of March 31, 2020, the Company expects amortization expense in future periods to be as follows (in thousands):



	Amortization Expense
2020 (remaining nine months)	$	4,561
2021	6,081
2022	4,427
2023	100
2024	66
Total expected future amortization expense	$	15,235

Leases (Tables)

3 Months Ended

Mar. 31, 2020

Leases [Abstract]

Assets And Liabilities, Lease [Table Text Block]

The table below presents the lease-related assets and liabilities recorded on the balance sheet.



		March 31,		December 31,
(in thousands)	Classification on the Balance Sheet	2020		2019
Assets
Operating lease assets	Operating lease - right of use asset	$	38,760	$	40,551
Finance lease assets	Property and equipment, net	1,007		1,299
Total lease assets		$	39,767	$	41,850

Liabilities
Current
Operating	Operating lease liabilities, current	$	7,968	$	7,663
Finance	Accrued liabilities	148		124
Noncurrent
Operating	Operating lease liabilities, noncurrent	41,486		44,015
Finance	Other noncurrent liabilities	—		54
Total lease liabilities		$	49,602	$	51,856

Lease, Cost [Table Text Block]

The weighted average remaining lease term and the weighted average discount rate of the Company's leases were as follows:



	March 31, 2020
Weighted average remaining lease term (years)
Operating leases	6.3
Finance leases	0.8
Weighted average discount rates
Operating leases	5.0	%
Finance leases	5.0	%

Supplemental cash flow information related to leases was as follows (in thousands):



	Three Months Ended
	March 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	2,791
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	$	562

Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Employee stock-based compensation

The following table shows a summary of the stock-based compensation expense included in the condensed consolidated statements of operations for the three months ended March 31, 2020 and 2019:



	Three Months Ended
	March 31,
	2020		2019
	(in thousands)
Cost of revenues	$	614	$	545
Research and development	3,437		2,340
Sales and marketing	1,560		1,068
General and administrative	4,386		4,492
Total stock-based compensation	$	9,997	$	8,445

Stock option activity

A summary of the Company’s stock option activity is as follows:



	Outstanding Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
						(in thousands)
Balance as of December 31, 2019	2,866,675		$	40.54	6.0	$	125,647
Granted	82,300		$	88.57
Exercised	(144,989	)	$	32.51
Canceled	(19,235	)	$	80.57
Balance as of March 31, 2020	2,784,751		$	42.11	6.2	$	126,495
Vested and expected to vest - March 31, 2020	2,620,436		$	39.53	6.0	$	125,595
Exercisable - March 31, 2020	2,073,385		$	29.22	5.3	$	120,221

Restricted stock units activity

A summary of the Company’s RSU activity is as follows:



	Outstanding RSUs		Weighted Average Grant Date Fair Value Per Share

Balance as of December 31, 2019	1,214,818		$	67.99
Granted	64,397		$	87.34
Vested	(138,260	)	$	59.51
Canceled	(23,348	)	$	69.61
Balance as of March 31, 2020	1,117,607		$	70.12
Outstanding and expected to vest - March 31, 2020	826,637		$	68.49

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The computations for basic and diluted net income per share are as follows:



	Three Months Ended
	March 31,
	2020		2019
	(in thousands, except per share data)
Numerator:
Net income	$	18,694	$	13,266
Denominator:
Weighted-average shares used in computing net income per share:
Basic	39,112		39,109
Effect of potentially dilutive securities:
Common stock options	1,423		1,970
Restricted stock units	311		467
Diluted	40,846		41,546
Net income per share:
Basic	$	0.48	$	0.34
Diluted	$	0.46	$	0.32

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

Potentially dilutive securities not included in the calculation of diluted net income per share because doing so would be anti-dilutive are as follows:



	Three Months Ended
	March 31,
	2020	2019
	(in thousands)
Common stock options	582	343
Restricted stock units	66	38
	648	381

Segment Information and Information about Geographic Area (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Revenues be geographic area

Revenues by sales channel are as follows (in thousands):



	Three Months Ended
	March 31,
	2020		2019
Direct	$	50,005	$	43,039
Partner	36,258		32,304
Total	$	86,263	$	75,343

Revenues and property and equipment, net, by geographic area

Revenue by geographic area, based on the customer's billing address, is as follows:



	Three Months Ended
	March 31,
	2020		2019
	(in thousands)
United States	$	54,963	$	48,621
Foreign	31,300		26,722
Total	$	86,263	$	75,343

Property and equipment, net, by geographic area, is as follows:



	March 31,		December 31,
	2020		2019
	(in thousands)
United States	$	44,614	$	46,100
India	11,358		9,221
Foreign	5,693		5,258
Total property and equipment, net	$	61,665	$	60,579

The Company and Summary of Significant Accounting Policies Nonmarketable securities (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Payments to Acquire Investments		$ 600,000
Preferred Stock [Member]
Investments					$ 2,500,000
Other than Temporary Impairment Losses, Investments	$ 0		$ 0
Convertible Debt Securities [Member]
Investments			$ 600,000	$ 600,000

Fair Value of Financial Instruments - Cash and Cash Equivalents, Available-for-sale Securities Reconciliation (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	$ 1,966	$ 1,071
Unrealized (Losses)	(556)	(5)
Debt Securities, Available-for-sale, Amortized Cost	433,319	417,332
Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	147,565	87,559
Fair Value	434,729	418,398
amortized cost [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	147,554	87,559
Cash and cash equivalents:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	11	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Short-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	183,308	211,089
Current Assets [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	1,163	246
Unrealized (Losses)	(84)	(4)
Current Assets [Member] \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	184,387	211,331
Long-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	792	825
Unrealized (Losses)	(472)	(1)
Debt Securities, Available-for-sale, Amortized Cost		118,684
Long-term investments \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	102,777	119,508
Long-term investments \| Reported Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	102,457
Asset backed securities \| Short-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	9	11
Unrealized (Losses)	0	0
Debt Securities, Available-for-sale, Amortized Cost	3,017	2,438
Asset backed securities \| Current Assets [Member] \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	3,026	2,449
Asset backed securities \| Long-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	79	193
Unrealized (Losses)	(72)	(1)
Debt Securities, Available-for-sale, Amortized Cost	39,983	40,001
Asset backed securities \| Long-term investments \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	39,990	40,193
Corporate bonds \| Cash and cash equivalents:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Corporate bonds \| Cash and cash equivalents: \| amortized cost [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	1,517
Corporate bonds \| Short-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	17	51
Unrealized (Losses)	(84)	(1)
Debt Securities, Available-for-sale, Amortized Cost	23,975	33,048
Corporate bonds \| Current Assets [Member] \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	23,908	33,098
Corporate bonds \| Long-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	169	262
Unrealized (Losses)	(390)	0
Debt Securities, Available-for-sale, Amortized Cost	46,065	32,236
Corporate bonds \| Long-term investments \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	45,844	32,498
US government agencies \| Cash and cash equivalents:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0
US government agencies \| Cash and cash equivalents: \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	15,449
US government agencies \| Cash and cash equivalents: \| amortized cost [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	15,439
US government agencies \| Short-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	1,137	184
Unrealized (Losses)	0	(3)
Debt Securities, Available-for-sale, Amortized Cost	155,316	173,364
US government agencies \| Current Assets [Member] \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	156,453	173,545
US government agencies \| Long-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized Gains	544	370
Unrealized (Losses)	(10)	0
Debt Securities, Available-for-sale, Amortized Cost	16,409	46,447
US government agencies \| Long-term investments \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	16,943	46,817
Commercial Paper [Member] \| Cash and cash equivalents:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0
Commercial Paper [Member] \| Cash and cash equivalents: \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	1,200	3,399
Commercial Paper [Member] \| Cash and cash equivalents: \| amortized cost [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	1,200	3,399
Commercial Paper [Member] \| Short-term investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	1,000	2,239
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0
Commercial Paper [Member] \| Current Assets [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Unrealized (Losses)		0
Commercial Paper [Member] \| Current Assets [Member] \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value	1,000	2,239
Cash [Member] \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	94,365
Cash [Member] \| Cash and cash equivalents:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	94,365	84,102
Money market funds \| Cash and cash equivalents:
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	35,033	58
Money market funds \| Cash and cash equivalents: \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	35,033	$ 58
Corporate bonds \| Cash and cash equivalents: \| Fair Value, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	$ 1,518

Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	$ 226,570	$ 214,731
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	55,843	85,617
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	22,918	33,890
Debt Securities, Available-for-sale, Amortized Cost	433,319	417,332
Debt Securities, Available-for-sale	305,331	334,238
Level 1 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	35,033	58
Debt Securities, Available-for-sale		58
Financial Instruments, Owned, at Fair Value	35,033
Level 2 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	0	0
Financial Instruments, Owned, at Fair Value	305,331	334,238
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	2,200	5,638
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	0	0
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	0	0
Debt Securities, Available-for-sale	2,200	5,638
Commercial paper \| Level 1 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Paper, at Carrying Value	0	0
Commercial paper \| Level 2 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Paper, at Carrying Value	2,200	5,638
US government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	171,901	173,546
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	15,712	46,816
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	1,231	0
Debt Securities, Available-for-sale	188,844	220,362
US government agencies \| Level 1 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
US Government Agencies Securities, at Carrying Value	0	0
US government agencies \| Level 2 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
US Government Agencies Securities, at Carrying Value	188,844	220,362
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	25,428	33,098
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	24,156	23,251
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	21,687	9,247
Debt Securities, Available-for-sale	71,271	65,596
Corporate bonds \| Level 1 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value	0	0
Corporate bonds \| Level 2 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value	71,271	65,596
Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	27,041	2,449
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	15,975	15,550
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	0	24,643
Debt Securities, Available-for-sale	43,016	42,642
Asset backed securities \| Level 1 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-Backed Securities, at Carrying Value	0	0
Asset backed securities \| Level 2 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-Backed Securities, at Carrying Value	43,016	42,642
Fair Value \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	35,033	58
Financial Instruments, Owned, at Fair Value	340,364	334,296
Fair Value \| Commercial paper \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Paper, at Carrying Value	2,200	5,638
Fair Value \| US government agencies \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
US Government Agencies Securities, at Carrying Value	188,844	220,362
Fair Value \| Corporate bonds \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value	71,271	65,596
Fair Value \| Asset backed securities \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-Backed Securities, at Carrying Value	43,016	42,642
Cash and cash equivalents:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	11	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Cash and cash equivalents: \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0
Cash and cash equivalents: \| US government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0
Cash and cash equivalents: \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ 0	$ 0

Fair Value of Financial Instruments - Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	$ 226,570	$ 214,731
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	55,843	85,617
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	22,918	33,890
Debt Securities, Available-for-sale	305,331	334,238
Commercial Paper [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	2,200	5,638
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	0	0
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	0	0
Debt Securities, Available-for-sale	2,200	5,638
US government agencies
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	171,901	173,546
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	15,712	46,816
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	1,231	0
Debt Securities, Available-for-sale	188,844	220,362
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	25,428	33,098
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	24,156	23,251
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	21,687	9,247
Debt Securities, Available-for-sale	71,271	65,596
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	27,041	2,449
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	15,975	15,550
Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value	0	24,643
Debt Securities, Available-for-sale	$ 43,016	$ 42,642

Fair Value of Financial Instruments - Derivatives (Details) $ in Thousands, € in Millions, ₨ in Millions, £ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 GBP (£) contract	Mar. 31, 2020 EUR (€) contract	Mar. 31, 2020 INR (₨) contract	Mar. 31, 2020 USD ($) contract	Dec. 31, 2019 GBP (£) contract	Dec. 31, 2019 EUR (€) contract	Dec. 31, 2019 INR (₨) contract	Dec. 31, 2019 USD ($) contract
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	$ 125	$ 213
Foreign currency contract, asset, fair value disclosure						$ 1,470				$ 942
Foreign Currency Contracts, Liability, Fair Value Disclosure						(1,339)				(1,074)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Foreign currency contract, asset, fair value disclosure						516				515
Foreign Currency Contracts, Liability, Fair Value Disclosure						(280)				(550)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Foreign currency contract, asset, fair value disclosure						954				427
Foreign Currency Contracts, Liability, Fair Value Disclosure						$ (1,059)				$ (524)
Foreign Currency Contract, INR [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount \| ₨					₨ 443.4				₨ 756.0
Foreign Currency Contract, INR [Member] \| Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount \| ₨					₨ 1,560.0
Forward Contracts \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, number of instruments held \| contract			13	13	13	13	15	15	15	15
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, number of instruments held \| contract			39	39	39	39	26	26	26	26
Foreign Currency Contract, Euro [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount \| €				€ 13.1				€ 20.0
Foreign Currency Contract, Euro [Member] \| Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount \| €				€ 22.3				€ 24.2
Foreign Currency Contract, Pound [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount \| £			£ 6.2				£ 5.6
Foreign Currency Contract, Pound [Member] \| Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount \| £			£ 9.4				£ 9.7

Fair Value of Financial Instruments - Gains (Losses) Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Other foreign currency transactions loss	$ (871)	$ (183)
Total foreign exchange loss, net	(67)	(160)
Other Nonoperating Expense	(68)	(63)
Other expense, net	(135)	(223)
Forward Contracts \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain from non-designated forward contracts	$ 804	$ 23

Fair Value of Financial Instruments Fair Value of Non-marketable securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Other Investment Not Readily Marketable [Line Items]
Unrealized Gains		$ 1,966	$ 1,071
Payments to Acquire Investments	$ 600
Preferred Stock [Member]
Other Investment Not Readily Marketable [Line Items]
Investments					$ 2,500
Convertible Debt Securities [Member]
Other Investment Not Readily Marketable [Line Items]
Investments			600	$ 600
Current Assets [Member]
Other Investment Not Readily Marketable [Line Items]
Unrealized Gains		1,163	246
Long-term investments
Other Investment Not Readily Marketable [Line Items]
Unrealized Gains		792	825
US government agencies \| Long-term investments
Other Investment Not Readily Marketable [Line Items]
Unrealized Gains		$ 544	$ 370

Fair Value of Financial Instruments Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Foreign Exchange Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	$ 410	$ 251
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(248)	13
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	162	264
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(37)	(51)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	125	$ 213
Foreign Currency Contract, INR [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	1,000
Revenues [Member] \| Foreign Currency Contract, Euro and INR [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ 1,200

Fair Value of Financial Instruments Additional Information (Details)	3 Months Ended
	Mar. 31, 2020 security
Fair Value Disclosures [Abstract]
Marketable Securities, Securities In Unrealized Loss Positions, Qualitative Disclosure, Number Of Positions	0

Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment	$ 191,109		$ 183,893
Finance leases - right of use asset	1,007		1,299
Less: accumulated depreciation and amortization	(129,444)		(123,314)
Property and equipment, net	61,665		60,579
Depreciation and amortization expense	6,100	$ 6,400
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, net	116,810		112,599
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, net	26,154		26,137
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, net	8,133		6,973
Finance leases - right of use asset
Property, Plant and Equipment [Line Items]
Property and equipment, net	3,503		3,503
Scanner appliances
Property, Plant and Equipment [Line Items]
Property and equipment, net	16,207		15,864
Scanner appliances and other computer equipment subject to subscription
Property, Plant and Equipment [Line Items]
Property and equipment, net	4,400		4,900
Scanner appliances and other computer equipment not placed in service
Property, Plant and Equipment [Line Items]
Property and equipment	800		900
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 20,302		$ 18,817

Revenue from Contracts with Customers - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized Contract Cost, Impairment Loss	$ 0	$ 0
Capitalized Contract Cost, Amortization Period	5 years
Retained earnings	$ 17,122,000		$ 23,194,000
Amortization of commissions assets	700,000	400,000
Revenue recognized	86,263,000	75,343,000
Subscription Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue recognized	$ 73,800,000	$ 64,200,000

Revenue from Contracts with Customers - Commission Asset Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Commission asset, current	$ 2,789	$ 2,568
Commission asset, noncurrent	$ 6,629	$ 6,454

Revenue from Contracts with Customers - Unbilled contracts (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 135,780
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 61,692
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 48,049
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 22,146
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 3,286
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 456
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	4 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 151
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years

Revenue from Contracts with Customers - Revenue by sales channel (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 86,263	$ 75,343
Direct
Disaggregation of Revenue [Line Items]
Revenues	50,005	43,039
Partner
Disaggregation of Revenue [Line Items]
Revenues	$ 36,258	$ 32,304

Business Combination - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 10, 2019	Mar. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Business Combination, Deferred Consideration Payment Period		18 months
Goodwill		$ 7,447	$ 7,447
1Mobility
Business Acquisition [Line Items]
Total purchase price	$ 1,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	900
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	200
Goodwill	$ 100
Estimated useful life of technology-based intangible assets	15 years
Developed Technology [Member]
Business Acquisition [Line Items]
Estimated useful life of technology-based intangible assets		4 years

Accumulated Other Comprehensive Income (Loss) Components of Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Debt Securities, Available-for-sale without Allowance for Credit Loss, Cumulative Gain (Loss), after Tax	$ 1,088	$ 138	$ 822	$ (545)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	465	172	340	(41)
Accumulated other comprehensive income (loss)	1,553	310	$ 1,162	$ (586)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	667	858
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	276	(38)
Change in unrealized loss on investments	266	683
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	125	213
Other Comprehensive Income (Loss), Net of Tax	391	896
Available-for-sale debt securities:
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before Reclassifications, Net of Tax, Attributable to Parent	351	655
Reclassification adjustment	85	(28)
Cash flow hedges:
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before Reclassifications, Net of Tax, Attributable to Parent	316	203
Reclassification adjustment	$ 191	$ (10)

Goodwill and Intangible Assets, Net - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule of Goodwill and Intangible Assets [Line Items]
Cost	$ 27,743		$ 27,743
Accumulated Amortization	(12,508)		(10,988)
Net Book Value	15,235		16,755
Total intangible assets, net	15,275		16,795
Amortization of intangible assets		$ 1,500
Goodwill	7,447		7,447
Intangible assets not subject to amortization [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Intangible assets not subject to amortization	$ 40		40
Developed technology
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted Average Life (Years)	4 years 7 months 6 days	4 years 7 months 6 days
Weighted Average Remaining Life (Years)	2 years 6 months	2 years 8 months 12 days
Cost	$ 26,356		26,356
Accumulated Amortization	(11,561)		(10,066)
Net Book Value	$ 14,795		16,290
Patent licenses
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted Average Life (Years)	14 years	14 years
Weighted Average Remaining Life (Years)	4 years 4 months 24 days	4 years 8 months 12 days
Cost	$ 1,387		1,387
Accumulated Amortization	(947)		(922)
Net Book Value	$ 440		$ 465

Goodwill and Intangible Assets, Net - Future Amortization (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
2020 (remaining nine months)	$ 4,561
2018	6,081
2019	4,427
2020	100
2021	66
Net Book Value	$ 15,235	$ 16,755

Leases (Details) - USD ($)	3 Months Ended
Leases (Details) - USD ($)	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating Lease, Payments	$ 2,791,000
Lease, Expense	4,400,000	$ 3,000,000.0
Operating Lease, Right-of-Use Asset	$ 38,760,000		$ 40,551,000
Operating Lease, Weighted Average Remaining Lease Term	6 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	5.00%
Finance Lease, Weighted Average Discount Rate, Percent	5.00%
Finance leases - right of use asset	$ 1,007,000		1,299,000
Lease, Right-of-Use Asset	39,767,000		41,850,000
Operating Lease, Liability, Current	(7,968,000)		(7,663,000)
Finance Lease, Liability, Current			(124,000)
Operating Lease, Liability, Noncurrent	41,486,000		44,015,000
Finance Lease, Liability, Noncurrent	0		54,000
Lease, Liability	49,602,000		$ 51,856,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	562,000
Accrued Liabilities [Member]
Lessee, Lease, Description [Line Items]
Finance Lease, Liability, Current	$ (148,000)

Stock-based Compensation - Stock Options (Details)	Mar. 31, 2020 shares
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	15,700,000
Number of shares available for grant	7,200,000
2000 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	0

Stock-based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total employee stock-based compensation	$ 9,997	$ 8,445
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized employee compensation cost	$ 14,900
Unrecognized employee compensation cost, period for recognition	2 years 2 months 12 days
Restricted Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized employee compensation cost	$ 60,500
Unrecognized employee compensation cost, period for recognition	2 years 6 months
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total employee stock-based compensation	$ 614	545
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total employee stock-based compensation	3,437	2,340
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total employee stock-based compensation	1,560	1,068
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total employee stock-based compensation	$ 4,386	$ 4,492

Stock-based Compensation - Stock Option Plan Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Outstanding Shares
Beginning balance (in shares)	2,866,675
Granted (in shares)	82,300
Exercised (in shares)	(144,989)
Canceled (in shares)	(19,235)
Ending balance (in shares)	2,784,751
Vested and expected to vest (in shares)	2,620,436
Exercisable (in shares)	2,073,385
Weighted Average Exercise Price
Weighted average exercise price, Beginning balance (in dollars per share)	$ 40.54
Weighted average exercise price, granted (in dollars per share)	88.57
Weighted average exercise price, exercised (in dollars per share)	32.51
Weighted average exercise price, canceled (in dollars per share)	80.57
Weighted average exercise price, Ending balance (in dollars per share)	42.11
Weighted average exercise price, Vested and expected to vest (in dollars per share)	39.53
Weighted average exercise price, Exercisable (in dollars per share)	$ 29.22
Weighted Average Remaining Contractual Life
Weighted average remaining contractual life (in years)	6 years 2 months 12 days	6 years
Weighted Average Remaining Contractual Life (Years), Vested and Expected to Vest	6 years
Weighted Average Remaining Contractual Life (Years), Exercisable	5 years 3 months 18 days
Aggregate Intrinsic Value
Aggregate intrinsic value	$ 126,495		$ 125,647
Aggregate intrinsic value, Vested and expected to vest	125,595
Aggregate intrinsic value, Exercisable	$ 120,221

Stock-based Compensation - Restricted Stock (Details) - Restricted Stock Units	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Outstanding RSUs
Beginning balance (in shares) \| shares	1,214,818
Granted (in shares) \| shares	64,397
Released (in shares) \| shares	(138,260)
Canceled (in shares) \| shares	(23,348)
Ending balance (in shares) \| shares	1,117,607
Outstanding and expected to vest (in shares) \| shares	826,637
Weighted Average Fair Value
Beginning balance (usd per share) \| $ / shares	$ 67.99
Granted (usd per share) \| $ / shares	87.34
Released (usd per share) \| $ / shares	59.51
Canceled (usd per share) \| $ / shares	69.61
Ending balance (usd per share) \| $ / shares	70.12
Outstanding and expected to vest (usd per share) \| $ / shares	$ 68.49

Stock-based Compensation Performance Based Awards and Options and Share Repurchase Program(Details)			3 Months Ended
	Nov. 02, 2019 shares	Feb. 05, 2018 USD ($)	Mar. 31, 2020 USD ($) increment shares	Mar. 31, 2019 USD ($)	May 07, 2020 USD ($)	Oct. 30, 2019 USD ($)	Dec. 21, 2018 shares	Oct. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized amount \| $		$ 100,000,000.0	$ 99,600,000			$ 100,000,000.0		$ 100,000,000.0
Share-Based Compensation, Percentage Of Awards Based On Achievement Of Performance Goals	50.00%
Stock-based compensation \| $			$ 9,997,000	$ 8,445,000
Repurchase Agreements, Maturities		P2Y
Aggregate number of shares authorized for repurchase			400,000,000.0
Shares repurchased during period, value \| $			$ 346,250
Share repurchase program, authorized amount \| $			$ 28,900,000
Share-Based Compensation, Termination Period Trigger			12 months
Share-Based Compensation, Percentage Of Shares That Will Vest Upon Trigger			100.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			138,260
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Restricted Stock Units \| Share Based Compensation Award 2018 Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation, Vesting Increments \| increment			3
Share-Based Compensation, Termination Period Trigger			12 months
Share-Based Compensation, Percentage Of Shares That Will Vest Upon Trigger			100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			14,864
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period As A Percentage Of Target			135.00%
Share-Based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Target Number Of Shares			11,030
Restricted Stock Units \| Time based shared based compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	48,683
Restricted Stock Units \| Time based shared based compensation [Member] \| Share Based Compensation Award 2018 Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Period, Number Of Quarterly Periods							16
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							56,250
Restricted Stock Units \| Performance Shares [Member] \| Share Based Compensation Award 2018 Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							33,089
Restricted Stock Units \| Performance Shares [Member] \| Share Based Compensation Award 2018 Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							33,088
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Stock Options \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	123,856
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation \| $			$ 100,000	$ 200,000
Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized amount \| $					$ 100,000,000.0

Stockholder's Equity (Details) - USD ($) shares in Millions	3 Months Ended
Stockholder's Equity (Details) - USD ($) shares in Millions	Mar. 31, 2020	Oct. 30, 2019	Oct. 30, 2018	Feb. 05, 2018
Equity [Abstract]
Share repurchase program, authorized amount	$ 28,900,000
Shares repurchased during period, value	346,250
Remaining authorized amount	$ 99,600,000	$ 100,000,000.0	$ 100,000,000.0	$ 100,000,000.0
Aggregate number of shares authorized for repurchase	400.0

Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 18,694	$ 13,266
Denominator:
Basic (shares)	39,112	39,109
Common stock options (shares)	1,423	1,970
Restricted stock units (shares)	311	467
Diluted (shares)	40,846	41,546
Basic (USD per share)	$ 0.48	$ 0.34
Diluted (USD per share)	$ 0.46	$ 0.32
Antidilutive Securities
Antidilutive securities (shares)	648	381
Stock Options
Antidilutive Securities
Antidilutive securities (shares)	582	343
Restricted Stock Units
Antidilutive Securities
Antidilutive securities (shares)	66	38

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ (3,523)	$ (2,571)
Effective tax rate	15.90%	16.20%
Unrecognized Tax Benefits	$ 8,100		$ 7,800
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 4,400		$ 4,200

Segment Information and Information about Geographic Area - Revenue by geographic area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 86,263	$ 75,343
United States
Disaggregation of Revenue [Line Items]
Revenues	54,963	48,621
Foreign
Disaggregation of Revenue [Line Items]
Revenues	$ 31,300	$ 26,722

Segment Information and Information about Geographic Area - Property and Equipment, net (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in segment) \| segment	1
Property and equipment, net	$ 61,665	$ 60,579
United States
Segment Reporting Information [Line Items]
Property and equipment, net	44,614	46,100
Other
Segment Reporting Information [Line Items]
Property and equipment, net	5,693	5,258
india [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 11,358	$ 9,221