Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-based employee compensation Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Fair value assumptions of options granted to employees Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Convertible preferred stock Convertible Preferred Stock [Member] Stock Options Stock Options [Member] Contingently issuable shares related to an acquisition Contingently Issuable Shares [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Numerator: Numerator [Abstract] Numerator [Abstract] Net income (loss) Net Income (Loss) Attributable to Parent Net income attributable to participating securities Participating Securities, Distributed and Undistributed Earnings Net income (loss) attributable to common stockholders - basic Net Income (Loss) Available to Common Stockholders, Basic Undistributed earnings allocated to participating securities Undistributed Earnings Allocated to Participating Securities Net income (loss) attributable to common stockholders - diluted Net Income (Loss) Available to Common Stockholders, Diluted Denominator: Denominator [Abstract] Denominator [Abstract] Weighted - average shares used in computing net income (loss) per share attributable to common stockholders - basic (shares) Weighted Average Number of Shares Outstanding, Basic Effect of potentially dilutive securities: Common stock options Incremental Common Shares Attributable to Share-based Payment Arrangements Weighted - average shares used in computing net income (loss) per share attributable to common stockholders - diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Basic (USD per share) Earnings Per Share, Basic Diluted (USD per share) Earnings Per Share, Diluted Antidilutive Securities Antidilutive Securities [Abstract] Antidilutive Securities [Abstract] Antidilutive securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Segment Reporting [Abstract] Revenues by geographic area Schedule of Segment Reporting Information, by Segment [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Remainder of 2013 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2018 and thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Net Book Value Finite-Lived Intangible Assets, Net Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Money Market Funds Money Market Funds [Member] Commercial Paper Commercial Paper [Member] Corporate bonds Corporate Bond Securities [Member] Municipal bonds Municipal Bonds [Member] US Government Agencies US Government Agencies Debt Securities [Member] Asset backed securities Asset-backed Securities [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Cash and Cash Equivalents Cash and Cash Equivalents [Member] Short-term Investments Available-for-sale Securities, Line Item [Member] Available-for-sale Securities, Line Item [Member] Long-term Investments Long-Term Investments [Member] Long-Term Investments [Member] Restricted Cash Restricted Cash and Cash Equivalents, Line Item [Member] Restricted Cash and Cash Equivalents, Line Item [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash Amortized cost Available-for-sale Securities, Amortized Cost Basis Unrealized gains Available-for-sale Securities, Gross Unrealized Gains Unrealized losses Available-for-sale Securities, Gross Unrealized Losses Fair value Available-for-sale Securities, Current Restricted cash- cash Restricted Cash and Cash Equivalents, Noncurrent Net Income (Loss) Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Forward Contracts Forward Contracts [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative, number of instruments held Derivative, Number of Instruments Held Derivative, notional amount Derivative, Notional Amount Foreign currency contract, asset, fair value disclosure Foreign Currency Contract, Asset, Fair Value Disclosure Derivative instruments not designated as hedging instruments, loss Derivative Instruments Not Designated as Hedging Instruments, Loss Foreign currency transaction loss, before tax Foreign Currency Transaction Loss, before Tax Derivative instruments not designated as hedging instruments, gain Derivative Instruments Not Designated as Hedging Instruments, Gain Foreign currency transaction gain, before tax Foreign Currency Transaction Gain, before Tax Other Income and Expenses [Abstract] Foreign exchange gains (losses), net Foreign Currency Transaction Gain (Loss), before Tax Other income (expense) Other non operating income expense other Other non operating income expense other Other income (expense), net Other Nonoperating Income (Expense) Accounting Policies [Abstract] The Company and Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Future Minimum Lease Payments for Capital and Operating Leases Schedule of Future Minimum Lease Payments for Operating and Capital Leases [Table Text Block] Schedule of Future Minimum Lease Payments for Operating and Capital Leases [Table Text Block] Property, Plant and Equipment [Abstract] Property and equipment Property, Plant and Equipment [Table Text Block] Schedule of Property, Plant and Equipment [Table] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Computer equipment Computer Equipment [Member] Computer software Software [Member] Furniture, fixtures and equipment Furniture and Fixtures [Member] Scanner appliances Scanner appliances [Member] Scanner appliances [Member] Scanner appliances and other computer equipment subject to subscription Scanner appliances and other computer equipment subject to subscription [Member] Scanner appliances and other computer equipment subject to subscription [Member] Scanner appliances and other computer equipment not placed in service Scanner Appliances and Other Computer Equipment Not Placed in Service [Member] Scanner Appliances and Other Computer Equipment Not Placed in Service [Member] Leasehold improvements Leasehold Improvements [Member] Other fixed assets not placed in service Other Fixed Assets Not Placed in Service [Member] Other Fixed Assets Not Placed in Service [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment Property, Plant and Equipment, Gross Depreciation and amortization expense Depreciation, Depletion and Amortization, Including Capital Leases Depreciation, Depletion and Amortization, Including Capital Leases Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Property, Plant and Equipment, Net Capital lease Capital Leased Assets, Gross Capital lease, accumulated depreciation Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Cost of revenues Cost of Sales [Member] Research and development Research and Development Expense [Member] Selling and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Stock-based employee compensation Allocated Share-based Compensation Expense Unrecognized employee compensation cost Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Unrecognized employee compensation cost, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Non-employee share-based compensation expense Share-based Goods and Nonemployee Services Transaction, Expense Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Mature within one year Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value After one year through two years Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value Over two years Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value Fair value Available-for-sale Securities, Fair Value Disclosure Description of business Business Description and Accounting Policies [Text Block] Basis of presentation Basis of Accounting, Policy [Policy Text Block] Principles of consolidation Consolidation, Policy [Policy Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Concentration of credit risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Cash, cash equivalents, short-term and long-term investments Cash, Cash Equivalents, Short-Term and Long-Term Investments Policy [Policy Text Block] Cash, Cash Equivalents, Short-Term and Long-Term Investments Policy [Policy Text Block] Recent accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization expense Depreciation, Depletion and Amortization Bad debt expense Provision for Doubtful Accounts Loss on disposal of property and equipment Gain (Loss) on Sale of Property Plant Equipment Stock-based compensation Share-based Compensation Non-cash interest expense Other Noncash Expense Amortization of premiums on investments Accretion (Amortization) of Discounts and Premiums, Investments Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Deferred revenues Increase (Decrease) in Deferred Revenue Other noncurrent liabilities Increase (Decrease) in Other Noncurrent Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of investments Payments to Acquire Short-term Investments Sales and maturities of investments Proceeds from Sale, Maturity and Collection of Short-term Investments Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Release of restricted cash Increase (Decrease) in Restricted Cash Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Principal payments under capital lease obligations Repayments of Long-term Capital Lease Obligations Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Vesting of early exercised common stock options Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition, Early Exercised Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition, Early Exercised Purchases of property and equipment included in accrued liabilities Capital Expenditures Incurred but Not yet Paid Income Tax Disclosure [Abstract] Unrecognized tax benefits Unrecognized Tax Benefits Unrecognized Tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Statement of Other Comprehensive Income [Abstract] Change in foreign currency translation gain (loss), tax Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax Change in net unrealized gain (loss) on investments, tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Net change, tax Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Statement of Financial Position [Abstract] Allowance for Doubtful Accounts Receivable Allowance for Doubtful Accounts Receivable Preferred Stock, Par or Stated Value Per Share (USD per share) Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Common Stock, Par or Stated Value Per Share (USD per share) Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares Issued Common Stock, Shares, Issued Common Stock, Shares Outstanding Common Stock, Shares, Outstanding Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value Estimate of Fair Value, Fair Value Disclosure [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Basis Fair Value, Measurements, Recurring [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Available-for-sale securities, fair value Restricted Stock Restricted Stock [Member] Shares granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Segment Information and Information about Geographic Area Segment Reporting Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Goodwill and Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Income Statement [Abstract] Revenues [Abstract] Revenues [Abstract] Revenues Revenues Cost of revenues Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research and Development Expense Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Total operating expenses Operating Expenses Income (loss) from operations Operating Income (Loss) Other income (expense), net: Other Income (Expense), Net [Abstract] Other Income (Expense), Net [Abstract] Interest expense Interest Expense Interest income Investment Income, Interest Other income (expense), net Total other income (expense), net Nonoperating Income (Expense) Income (loss) before provision for (benefit from) income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for (benefit from) income taxes Income Tax Expense (Benefit) Net income (loss) Net income (loss) attributable to common stockholders Net income (loss) per share attributable to common stockholders: Weighted average shares used in computing net income (loss) per share attributable to common stockholders: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (shares) Diluted (shares) Schedule of Other Nonoperating Income (Expense) Schedule of Other Nonoperating Income (Expense) [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Geographical Area [Axis] Geographical [Axis] Segment, Geographical [Domain] Segment, Geographical [Domain] United States UNITED STATES Other Segment, Geographical, Groups of Countries, Group One [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of operating segments Number of Operating Segments Leased Assets [Table] Leased Assets [Table] Leased Assets [Table] Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Maintenance and Support Maintenance and Support [Member] Maintenance and Support [Member] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Capital Addition Purchase Commitments Capital Addition Purchase Commitments [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Capital Lease Obligations Capital Lease Obligations [Member] Leased Assets [Line Items] Leased Assets [Line Items] [Line Items] for Leased Assets [Table] Debt interest rate Debt Instrument, Interest Rate, Stated Percentage Debt face amount Debt Instrument, Face Amount Recorded unconditional purchase obligation Recorded Unconditional Purchase Obligation Rent expense Operating Leases, Rent Expense Deferred rent credit Deferred Rent Credit, Noncurrent Sales and excise tax payable, current Sales and Excise Tax Payable, Current Carrying value of intangible assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Intangible assets future periods amortization expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Operating Leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Remainder of 2013 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2014 Operating Leases, Future Minimum Payments, Due in Two Years 2015 Operating Leases, Future Minimum Payments, Due in Three Years 2016 Operating Leases, Future Minimum Payments, Due in Four Years 2017 Operating Leases, Future Minimum Payments, Due in Five Years 2018 and thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total mimimum lease payments Operating Leases, Future Minimum Payments Due Capital Leases Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Remainder of 2013 Capital Leases, Future Minimum Payments Due, Next Twelve Months 2014 Capital Leases, Future Minimum Payments Due in Two Years 2015 Capital Leases, Future Minimum Payments Due in Three Years 2016 Capital Leases, Future Minimum Payments Due in Four Years 2017 Capital Leases, Future Minimum Payments Due in Five Years 2018 and thereafter Capital Leases, Future Minimum Payments Due Thereafter Total minimum lease payments Capital Leases, Future Minimum Payments Due Less amount representing interest Capital Leases, Future Minimum Payments, Interest Included in Payments Present value of minimum payments Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments Less current portion Capital Lease Obligations, Current Capital lease obligations, noncurrent Capital Lease Obligations, Noncurrent Schedule of Cash and Cash Equivalents, Available-for-sale Securities, Restricted Cash Reconciliation Available-for-sale Securities [Table Text Block] Schedule of Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of Available-for-Sale Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Goodwill and Intangible Assets [Table] Schedule of Goodwill and Intangible Assets [Table] Schedule of Goodwill and Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Existing technology Developed Technology Rights [Member] Patent license Patents [Member] Non-competition agreements and other Non-competition Agreements and Other Intangible Assets [Member] [Member] Non-competition Agreements and Other Intangible Assets [Member] [Member] Schedule of Goodwill and Intangible Assets [Line Items] Schedule of Goodwill and Intangible Assets [Line Items] [Line Items] for Schedule of Goodwill and Intangible Assets [Table] Estimated Lives Finite-Lived Intangible Asset, Useful Life Cost Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible assets not subject to amortization Indefinite-Lived Intangible Assets (Excluding Goodwill) Total intangible assets, net Intangible Assets, Net (Excluding Goodwill) Amortization of intangible assets Amortization of Intangible Assets Goodwill Goodwill Outstanding Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Ending balance (in shares) Vested and expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average exercise price, granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted average exercise price, exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price, canceled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Ending balance (in dollars per share) Vested and expected to vest (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Weighted Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value [Abstract] Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Equity Incentive Plan Annual Increase Feature [Axis] Equity Incentive Plan Annual Increase Feature [Axis] Equity Incentive Plan Annual Increase Feature [Axis] Equity Incentive Plan Annual Increase Feature [Domain] Equity Incentive Plan Annual Increase Feature [Domain] [Domain] for Equity Incentive Plan Annual Increase Feature [Axis] Increase of Number of Shares Option Increase of Number of Shares Option [Member] Increase of Number of Shares Option [Member] Increase of Percentage of Shares Outstanding Option Increase of Percentage of Shares Outstanding Option [Member] Increase of Percentage of Shares Outstanding Option [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2012 Equity Incentive Plan 2012 Equity Incentive Plan [Member] 2012 Equity Incentive Plan [Member] 2000 Equity Incentive Plan 2000 Equity Incentive Plan [Member] 2000 Equity Incentive Plan [Member] Number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Equity incentive plan annual increase (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Annual Increase, Shares Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Annual Increase, Shares Equity incentive plan, annual increase, percent of shares outstanding Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Annual Increase, Percent of Shares Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Annual Increase, Percent of Shares Outstanding Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Term of award Share-based Compensation Arrangement by Share-based Payment Award, Term of Award Share-based Compensation Arrangement by Share-based Payment Award, Term of Award Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Number of shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Award strike price as a percentage of market value Share-based Compensation Arrangement by Share-based Payment Award, Award Strike Price as a Percentage of Market Value Share-based Compensation Arrangement by Share-based Payment Award, Award Strike Price as a Percentage of Market Value Number of shares subject to repurchase (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Subject to Repurchase Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Subject to Repurchase Share-based compensation arrangement by share-based payment award, number of unvested shares repurchased Share-based Compensation Arrangement by Share-based Payment Award, Number of Unvested Shares Repurchased Share-based Compensation Arrangement by Share-based Payment Award, Number of Unvested Shares Repurchased Liability for options early exercised Share-based Compensation Arrangement by Share Based Payment Award, Liability for Options Early Exercised Share-based Compensation Arrangement by Share Based Payment Award, Liability for Options Early Exercised Income Taxes Income Tax Disclosure [Text Block] Other Income (Expense), Net Other Income and Other Expense Disclosure [Text Block] Assets [Abstract] Assets [Abstract] Current assets: Assets, Current [Abstract] Short-term investments Short-term Investments Accounts receivable, net of allowance of $348 and $331 at June 30, 2013 and December 31, 2012, respectively Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Restricted cash Long-term investments Long-term Investments Property and equipment, net Intangible assets, net Other noncurrent assets Other Assets, Noncurrent Total assets Assets Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Deferred revenues, current Deferred Revenue, Current Capital lease obligations, current Total current liabilities Liabilities, Current Deferred revenues, noncurrent Deferred Revenue, Noncurrent Income taxes payable, noncurrent Accrued Income Taxes, Noncurrent Other noncurrent liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 5) Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at June 30, 2013 and December 31, 2012 Preferred Stock, Value, Issued Common stock, $0.001 par value; 1,000,000,000 shares authorized, 31,988,384 and 31,420,028 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Change in foreign currency translation gain (loss), net of zero tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Available-for-sale investments: Available-for-sale Securities [Abstract] Change in net unrealized gain (loss) on investments, net of zero tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Less: reclassification adjustment for net gain (loss) included in net income (loss) AdjustmentForGainLossOnInvestmentsIncludedInNetIncomeNetOfTax AdjustmentForGainLossOnInvestmentsIncludedInNetIncomeNetOfTax Net change, net of zero tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Other comprehensive loss, net Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent