Document and Entity Information [Abstract] Document And Entity Information [Abstract] Statement [Table] Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Class A Common Stock [Member] Common Class B [Member] Class B Common Stock [Member] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Voluntary Filers Entity Public Float Consolidated Balance Sheets [Abstract] Equity, Class of Treasury Stock [Axis] Class Of Treasury Stock [Domain] Class of Treasury Stock [Domain] Redeemable Convertible Preferred Stock [Member] Redeemable Convertible Preferred Stock [Member] Convertible Preferred Stock [Member] Convertible Preferred Stock [Member] Common Stock [Member] Common Stock [Member] Series A Preferred Stock [Member] Series A [Member] Series B Preferred Stock [Member] Series B [Member] Series C Preferred Stock [Member] Series C [Member] Series D Preferred Stock [Member] Series D [Member] Common Stock ClassA And Class B [Member] Common Stock Classa And Class B [Member] Class A And Class B [Member] Assets [Abstract] ASSETS Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS - End of period CASH AND CASH EQUIVALENTS - Beginning of period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Total cash, cash equivalents, and short-term investments, Estimated Fair Market Value Short-term Investments Short-term investments Short-term Investments, Total Accounts Receivable, Net, Current Accounts receivable (net of allowance for doubtful accounts of $5,460 and $2,672 at December 31, 2011 and 2010, respectively) Accounts Receivable, Net, Current, Total Deferred commissions Deferred Commissions Current Deferred commissions Prepaid Expense, Current Prepaid expenses Prepaid Expense, Current, Total Other Assets, Current Other current assets Assets, Current Total current assets Total current assets Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property and equipment, net Property and equipment, net Goodwill Goodwill-September 30, 2011 Goodwill-December 31, 2010 Goodwill Goodwill, Total Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Intangible Assets, Net (Excluding Goodwill), Total Other Assets, Noncurrent Other assets Other Assets, Noncurrent, Total Assets TOTAL ASSETS Liabilities and Equity [Abstract] LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Accrued Liabilities, Current Accrued liabilities Total Deferred Revenue, Current Deferred revenue Deferred Revenue, Current, Total Liabilities, Current Total current liabilities Deferred Tax Liabilities, Noncurrent DEFERRED TAX LIABILITIES Other Liabilities, Noncurrent OTHER LONG TERM LIABILITIES Other Liabilities, Noncurrent, Total Liabilities Total liabilities Commitments and Contingencies, COMMITMENTS AND CONTINGENCIES (Note 11) Redeemable convertible preferred stock. Redeemable Convertible Preferred Stock [Abstract] REDEEMABLE CONVERTIBLE PREFERRED STOCK (Note 12) Temporary Equity, Carrying Amount Temporary Equity, Carrying Amount, Ending Balance Temporary Equity, Carrying Amount, Beginning Balance Redeemable convertible preferred stock Temporary Equity, Carrying Amount, Total Redeemable convertible preferred stock Stockholders' Equity Attributable to Parent [Abstract] STOCKHOLDERS' EQUITY (Note 12): Preferred Stock, Value, Issued Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Convertible preferred stock Preferred Stock, Value, Issued, Total Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock Common Stock, Value, Issued, Total Additional Paid in Capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional paid-in capital Additional Paid in Capital, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Accumulated earnings (deficit) Retained Earnings (Accumulated Deficit), Total Stockholders' Equity Attributable to Parent BALANCE BALANCE Total stockholders' equity Liabilities and Equity TOTAL LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY Allowance for Doubtful Accounts Receivable, Current Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Accounts receivable, allowance for doubtful accounts Temporary Equity, Par or Stated Value Per Share Redeemable convertible preferred stock, par value Temporary Equity, Shares Issued Redeemable convertible preferred stock, shares issued Temporary Equity, Shares Outstanding Redeemable convertible preferred stock, shares outstanding Preferred Stock, Par or Stated Value Per Share Convertible preferred stock, par value Preferred Stock, Shares Issued Preferred Stock, Shares Issued, Total Convertible preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Convertible preferred stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Common stock, shares issued Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Consolidated Statements Of Operations [Abstract] Revenues Net revenue Revenues, Total Costs and expenses: The aggregate cost of goods produced and sold and services rendered during the reporting period exclusive of depreciation and amortization. Cost of Revenue Exclusive of Depreciation and Amortization Cost of revenue (exclusive of depreciation and amortization shown separately below) Selling and Marketing Expense Sales and marketing Selling and Marketing Expense, Total Research and Development Expense Product development Research and Development Expense, Total General and Administrative Expense General and administrative General and Administrative Expense, Total Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction, Total Costs and Expenses Total costs and expenses Operating Income (Loss) Income (loss) from operations Income (loss) from operations Nonoperating Income (Expense) Other income (expense), net Other income (expense), net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income (loss) before income taxes Income (loss) before income taxes Income Tax Expense (Benefit) Income tax expense Income Tax Expense (Benefit), Total Provision for income taxes Net Income (Loss) Attributable to Parent Net income Net income (loss) Net income (loss) Net Income (Loss) Available to Common Stockholders, Basic Net income (loss) attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic, Total Allocation of distributed earnings attributable to common stockholders Income (Loss) Per Share [Abstract] Net income (loss) per share attributable to common stockholders: Earnings Per Share, Basic Basic Earnings Per Share, Basic, Total Basic net income (loss) per share Earnings Per Share, Diluted Diluted Earnings Per Share, Diluted, Total Diluted net income (loss) per share Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted-average shares used to compute net income (loss) per share attributable to common stockholders: Number of shares used in basic calculation Basic Weighted Average Number of Shares Outstanding, Basic, Total Weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Number of shares used in diluted calculation Consolidated Statements Of Redeemable Convertible Preferred Stock, Stockholders' Equity And Comprehensive Income (Loss) [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Warrants [Member] Warrants [Member] Statement, Equity Components [Axis] Additional Paid In Capital [Member] Additional Paid-In Capital [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Member] Retained Earnings [Member] Accumulated Earnings (Deficit) [Member] Comprehensive Income [Member] Comprehensive Income (Loss) [Member] Shares, Issued BALANCE, shares BALANCE, shares Cumulative effect of accounting change for warrant valuation. Cumulative Effect Of Accounting Change For Warrant Valuation Cumulative effect of accounting change for warrant valuation Cumulative effect of accounting change for warrant valuation Cumulative effect of accounting change for warrant valuation Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock upon exercise of employee stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of Shares, Exercised Issuance of common stock upon exercise of employee stock options, shares Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments, Total Conversion of preferred stock to common stock upon initial public offering Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of preferred stock to common stock upon initial public offering, shares Conversion of preferred stock to common stock upon initial public offering, shares Stock Issued During Period, Value, New Issues Issuance of common stock upon initial public offering, net of offering costs Stock Issued During Period, Shares, New Issues Common stock, value issued Issuance of common stock upon initial public offering, net of offering costs, shares Issuance of common stock in connection with follow-on offering, net of offering costs. Issuance of Common Stock in Connection with Follow-on Offering, Net of Offering Costs Issuance of common stock in connection with follow-on offering, net of offering costs Issuance of common stock in connection with follow-on offering, net of offering costs, shares. Issuance of Common Stock in Connection with Follow On Offering, Net of Offering Costs, Shares Issuance of common stock in connection with follow-on offering, net of offering costs, shares Stock Issued During Period, Value, Employee Stock Purchase Plan Issuance of common stock in connection with employee stock purchase plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock in connection with employee stock purchase plan, shares Stock Issued During Period, Value, Acquisitions Issuance of common stock related to acquisitions Stock Issued During Period, Shares, Acquisitions Issuance of common stock related to acquisitions, shares Adjustments to additional paid in capital, vesting of early exercised stock options. Adjustments To Additional Paid In Capital, Vesting Of Early Exercised Stock Options Vesting of early exercised stock options Vesting of early exercised stock options Stock issued during period value, issuance of series a convertible preferred stock upon exercise of warrant. Stock Issued During Period Value, Issuance Of Series A Convertible Preferred Stock Upon Exercise Of Warrant Issuance of Series A convertible preferred stock upon exercise of warrant Issuance of Series A convertible preferred stock upon exercise of warrant Stock issued during period shares, issuance of series a convertible preferred stock upon exercise of warrant. Stock Issued During Period Shares, Issuance Of Series A Convertible Preferred Stock Upon Exercise Of Warrant Issuance of Series A convertible preferred stock upon exercise of warrant, shares Stock Repurchased and Retired During Period, Value Repurchase of unvested early exercised stock options Repurchase of unvested early exercised stock options Stock Repurchased and Retired During Period, Shares Repurchase of unvested early exercised stock options, shares Repurchase of unvested early exercised stock options, shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Total Stock-based compensation Tax Benefit from Stock Options Exercised Income tax benefit from employee stock option exercises Income tax benefit from employee stock option exercises Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Foreign currency translation adjustment Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Change in net unrealized gain on investments Consolidated Statements Of Cash Flows [Abstract] OPERATING ACTIVITIES: Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to reconcile net income (loss) to net cash provided by operating activities: Provision for doubtful accounts and sales returns Provision for Doubtful Accounts and Sales Returns Provision for doubtful accounts and sales returns Share-based Compensation Stock-based compensation Share-based Compensation, Total Excess Tax Benefit from Share-based Compensation, Operating Activities Excess income tax benefit from the exercise of stock options Excess income tax benefit from the exercise of stock options Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Accounts receivable Increase (decrease) in deferred commissions Increase (Decrease) in Deferred commissions Deferred commissions Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Increase (Decrease) in Accounts Payable and Other Operating Liabilities Accounts payable and other liabilities Increase (Decrease) in Income Taxes Income taxes, net Increase (Decrease) in Deferred Revenue Deferred revenue Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities INVESTING ACTIVITIES: Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Investments Purchases of investments Purchases of investments Payments to Acquire Investments, Total Proceeds from Sale of Investment Projects Sales of investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Maturities of investments Payments to Acquire Businesses, Net of Cash Acquired Purchases of intangible assets and acquisitions, net of cash acquired Cash paid for acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Increase (Decrease) in Restricted Cash (Increase) decrease in restricted cash and deposits (Increase) decrease in restricted cash Increase (Decrease) in Restricted Cash, Total (Increase) decrease in restricted cash and deposits Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities FINANCING ACTIVITIES: Proceeds from Issuance Initial Public Offering Conversion of preferred stock in connection with initial public offering Proceeds from initial public offering, net of offering costs Proceeds from follow-on offering. Proceeds from Follow On Offering Proceeds from follow-on offering, net of offering costs Proceeds from Issuance of Common Stock Proceeds from issuance of common stock The cash inflow associated with the amount received from holders early exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Proceeds From Stock Options Early Exercised Proceeds from early exercise of employee stock options Proceeds from issuance of employee stock purchase plan. Proceeds from Issuance of Employee Stock Purchase Plan Proceeds from the issuance of the employee stock purchase plan Proceeds from Warrant Exercises Proceeds from exercise of warrant Excess Tax Benefit from Share-based Compensation, Financing Activities Excess income tax benefit from the exercise of stock options Payments for Repurchase of Common Stock Repurchase of common stock Repurchase of common stock Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of Exchange Rate on Cash and Cash Equivalents EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS Effect of Exchange Rate on Cash and Cash Equivalents, Total Cash and Cash Equivalents, Period Increase (Decrease) CHANGE IN CASH AND CASH EQUIVALENTS Supplemental Cash Flow Information [Abstract] SUPPLEMENTAL DISCLOSURES OF OTHER CASH FLOW INFORMATION: Income Taxes Paid, Net Cash paid for income taxes Income Taxes Paid, Net, Total SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES: SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES: Conversion of Stock, Amount Converted Conversion of preferred stock to common stock Purchases of property and equipment recorded in accounts payable and accrued liabilities Purchases of Property and Equipment Recorded in Accounts Payable and Accrued Liabilities Purchases of property and equipment recorded in accounts payable and accrued liabilities Deferred offering costs not yet paid Deferred Offering Costs Not Yet Paid Deferred offering costs not yet paid Vesting of early exercised stock options Vesting of Early Exercised Stock Options Vesting of early exercised stock options Description Of Business And Basis Of Presentation [Abstract] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Description Of Business And Basis Of Presentation Summary Of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies Fair Value Measurements [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Acquisitions [Abstract] Business Combination Disclosure [Text Block] Acquisitions Cash And Investments [Abstract] Cash, Cash Equivalents, and Short-term Investments [Text Block] Cash And Investments Property And Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property And Equipment Goodwill And Other Intangible Assets [Abstract] Goodwill and Intangible Assets Disclosure [Text Block] Goodwill And Other Intangible Assets Accrued Liabilities [Abstract] Accrued Liabilities Disclosure [Text Block] Accrued Liabilities Disclosure [Text Block] Accrued Liabilities Other Income (Expense), Net [Abstract] Other Income and Other Expense Disclosure [Text Block] Other Income (Expense), Net Earnings Per Share [Text Block] Income (Loss) Per Share Commitments And Contingencies [Abstract] Commitments and Contingencies' Disclosure [Text Block]. Commitments And Contingencies Redeemable Convertible Preferred Stock And Stockholders' Equity [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Redeemable Convertible Preferred Stock And Stockholders' Equity Redeemable Convertible Preferred Stock And Stockholders' Equity Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Segment And Geographic Revenue Information [Abstract] SegmentReportingDisclosureTextBlock Segment And Geographic Revenue Information Employee Benefit Plan [Abstract] Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plan Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events Antidilutive Securities Name [Domain] Antidilutive Securities, Name [Domain] Equity Component [Domain] Equity Component [Domain]