Document and entity information abstract. Document And Entity Information [Abstract] Statement [Table] 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 Public Float Entity Current Reporting Status Entity Voluntary Filers Consolidated Balance Sheets [Abstract] Assets [Abstract] Assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of year Cash and cash equivalents at beginning of year Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Short-term Investments Short-term Investments, Total Short-term investments Receivables, Net, Current Receivables, Net, Current, Total Accounts receivable, net of allowance for doubtful accounts of $425 and $120 as of December 31, 2011 and 2010, respectively Income Taxes Receivable, Current Income tax receivable Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current, Total Prepaid expenses and other current assets Restricted Cash and Cash Equivalents, Current Restricted cash Deferred Tax Assets, Net, Current Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current, Beginning Balance Deferred Tax Assets, Net, Current, Total Deferred tax assets Assets, Current Total current assets Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Property and equipment, net Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, Total Goodwill Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill), Total Intangible assets, net Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Deferred Tax Assets, Net, Noncurrent Deferred Tax Assets, Net, Noncurrent, Total Deferred tax assets Other Assets, Noncurrent Other Assets, Noncurrent, Total Other non-current assets Assets Total assets Liabilities and Equity [Abstract] Liabilities, redeemable preferred stock and stockholders' equity (deficit) Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Accrued Income Taxes, Current Income tax payable Accrued Liabilities, Current Accrued expenses Accrued Liabilities, Current, Total Deferred Revenue, Current Deferred revenue Deferred Revenue, Current, Total Deferred Tax Liabilities, Current Deferred tax liabilities Liabilities, Current Total current liabilities Deferred Revenue, Noncurrent Deferred revenue, less current portion Deferred Revenue, Noncurrent, Total Deferred Tax Liabilities, Noncurrent Deferred tax liabilities Other Liabilities, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent, Total Liabilities Total liabilities Commitments and Contingencies's Commitments and contingencies (Note 7) Temporary Equity, Carrying Amount Temporary Equity, Carrying Amount, Ending Balance Temporary Equity, Carrying Amount, Beginning Balance Preferred stock Temporary Equity, Carrying Amount, Total Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity (deficit) Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock: $0.0001 par value; 104,163,858 shares authorized; 80,685,391 and 38,987,423 shares issued and outstanding as of December 31, 2011 and 2010 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 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 deficit Retained Earnings (Accumulated Deficit), Total Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity (deficit) Total stockholders' equity (deficit) Liabilities and Equity Total liabilities, redeemable preferred stock and stockholders' equity (deficit) 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 Preferred stock, par value Temporary Equity, Shares Authorized Preferred stock, shares authorized Temporary Equity, Shares Issued Preferred stock, shares issued Temporary Equity, Shares Outstanding Preferred stock, shares outstanding Temporary Equity, Liquidation Preference Preferred stock, liquidation preference Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Issued, Total 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 [Abstract] Revenue: Revenue From Listing Listing Other Revenue, Net Other Revenues Total revenue Costs and Expenses [Abstract] Costs and expenses: Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization Cost of revenue (exclusive of amortization shown separately below) Cost of Goods and Services Sold, Total Research and Development Expense Product development Research and Development Expense, Total Selling and Marketing Expense Sales and marketing Selling and Marketing Expense, Total General and Administrative Expense General and administrative General and Administrative Expense, Total Amortization of Intangible Assets Amortization of intangible assets Amortization of Intangible Assets, Total Amortization expense Costs and Expenses Total costs and expenses Operating Income (Loss) Operating income Nonoperating Income (Expense) [Abstract] Other income (expense): Interest Expense Interest expense Interest expense Interest Expense, Total Investment Income, Interest Interest income Other Nonoperating Income (Expense) Other income (expense) Other Nonoperating Income (Expense), Total Nonoperating Income (Expense) Total other income (expense) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income taxes Income Tax Expense (Benefit) Income tax (expense) benefit Income tax (expense) benefit Income Tax Expense (Benefit), Total Net Income (Loss) Attributable to Parent Net income Net income Net income Preferred Stock Dividends and Other Adjustments Cumulative preferred stock dividends and discount accretion Cumulative preferred stock dividends and discount accretion Preferred Stock Dividends and Other Adjustments, Total Net loss attributable to common stockholders. Net Loss Attributable to Common Stockholders Net loss attributable to common stockholders Net Loss Per Share [Abstract] Net loss per share attributable to common stockholders: Basic and diluted earnings per share. Basic and Diluted Earnings Per Share Basic and diluted Weighted average number of shares outstanding basic and diluted. Weighted Average Number of Share Outstanding Basic and Diluted Weighted average number of shares outstanding Consolidated Statements Of Changes In Redeemable Preferred Stock And Stockholders' Equity (Deficit) [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Parent [Member] Parent [Member] Common Stock [Member] Common Stock [Member] Additional Paid In Capital [Member] Additional Paid-In Capital [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Loss [Member] Retained Earnings [Member] Accumulated Deficit [Member] Comprehensive Income [Member] Total Comprehensive Income (Loss) [Member] Shares, Issued Balance, shares Balance, shares Stock Redeemed or Called During Period, Value Repurchase of preferred stock Redemption of preferred stock Stock Redeemed or Called During Period, Shares Repurchase of preferred stock, shares Redemption of preferred stock, shares Payments of Stock Issuance Costs Series D preferred stock issuance costs Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments Conversion of preferred stock to common stock Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments, Total Conversion of preferred stock to common shares Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of preferred stock to common stock, shares Dividends, Preferred Stock Payment of dividends for preferred stock Payment of dividends on preferred stock Dividends, Preferred Stock, Total Preferred Stock, Accretion of Redemption Discount Accretion of preferred stock to redemption values Accretion of preferred stock to redemption values Restricted Stock, Value, Shares Issued Net of Tax Withholdings Restricted stock withholding Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Restricted stock withholding, shares Temporary Equity, Accretion of Dividends Accretion of dividends Redemption of preferred stock. Redemption of Preferred Stock Redemption of preferred stock Redemption of preferred stock Redemption of preferred stock shares. Redemption of Preferred Stock Shares Redemption of preferred stock, shares Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options, net of shares witheld for taxes Stock Issued During Period, Shares, Employee Stock Purchase Plans Exercise of stock options, net of shares witheld for taxes, shares Stock Issued During Period, Value, Share-based Compensation, Gross Stock compensation expenses Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures, Total Stock Issued During Period, Value, New Issues Issuance of common stock Stock Issued During Period, Shares, New Issues Issuance of common stock, shares Exercise of stock options and warrants. Exercise of Stock Options and Warrants Exercise of stock options and warrants Exercise of stock options and warrants shares. Exercise of Stock Options and Warrants Shares Exercise of stock options and warrants, shares Income Tax Effects Allocated Directly to Equity, Employee Stock Options Excess tax benefits, Tax shortfall related to employee stock options Excess tax benefits, Tax shortfall related to employee stock options Stock Repurchased During Period, Value Repurchase of common stock Stock Repurchased During Period, Shares Repurchase of common stock, shares Treasury Stock, Retired, Par Value Method, Amount Retirement of treasury stock Retirement of treasury stock Treasury Stock, Shares, Retired Retirement of treasury stock, shares Retirement of treasury stock, shares Accumulated Other Comprehensive Loss [Abstract] Comprehensive Income: Translation Adjustment Functional to Reporting Currency, Net of Tax Translation Adjustment Functional to Reporting Currency, Net of Tax, Ending Balance Translation Adjustment Functional to Reporting Currency, Net of Tax, Beginning Balance Cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Unrealized Gain (Loss) on Investments Unrealized gain (loss) on short-term investments Unrealized Gain (Loss) on Investments, Total Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income Consolidated Statements Of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation Depreciation Depreciation, Total Amortization of Financing Costs and Discounts Amortization of premiums on securities and other Amortization of Financing Costs and Discounts, Total Share-based Compensation Stock-based compensation Share-based Compensation, Total Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax (benefit) shortfall from stock-based compensation Excess tax (benefit) shortfall from stock-based compensation Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit), Total Gain (Loss) on Sale of Investments (Gain) loss on sale of investments (Gain) loss on sale of investments Gain (Loss) on Sale of Investments, Total Foreign Currency Transaction Gain (Loss), Unrealized Unrealized foreign exchange (gain) loss Unrealized foreign exchange (gain) loss Gain (Loss) on Sale of Derivatives Realized loss on foreign currency forwards Realized loss on foreign currency forwards Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities, net of assets and liabilities assumed in business combinations: Increase (Decrease) in Accounts Receivable Accounts receivable Accounts receivable Increase (Decrease) in Income Taxes Receivable Income tax receivable Income tax receivable Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accounts Payable, Total Increase (Decrease) in Accrued Liabilities Accrued expenses Increase (Decrease) in Accrued Liabilities, Total Increase (Decrease) in Income Taxes Payable Income taxes payable Increase (Decrease) in Deferred Revenue Deferred revenue Increase decrease in deferred rent and other non current liabilities. Increase Decrease In Deferred Rent and Other Non Current Liabilities Deferred rent and other non-current liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities Payments to Acquire Businesses, Net of Cash Acquired Cash paid for businesses acquired, net of cash acquired Cash paid for businesses acquired, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Increase (Decrease) in Restricted Cash Change in restricted cash Change in restricted cash Increase (Decrease) in Restricted Cash, Total Cash paid for trademarks and other assets acquire. Cash Paid For Trademarks and Other Assets Acquired Cash paid for trademarks and other assets acquired Cash paid for trademarks and other assets acquired Payments to Acquire Short-term Investments Purchases of short-term investments Purchases of short-term investments Proceeds from maturities of marketable securities. Proceeds from Maturities of Marketable Securities Proceeds from maturities of marketable securities Proceeds from sales of marketable securities and other. Proceeds from Sales of Marketable Securities and Other Proceeds from sales of marketable securities and other Net Settlement of Foreign Currency Forwards Net settlement of foreign currency forwards Net settlement of foreign currency forwards Payments for (Proceeds from) Derivative Instrument, Investing Activities, Total Payments to Acquire Productive Assets Purchases of property and equipment Purchases of property and equipment Payments to Acquire Productive Assets, Total Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities Proceeds from Stock Options Exercised Proceeds from exercise of options to purchase common stock Payments Related to Tax Withholding for Share-based Compensation Shares withheld for employee taxes Shares withheld for employee taxes Payments of Dividends, Preferred Stock and Preference Stock Payments of dividends on preferred stock Payments of dividends on preferred stock Proceeds from Issuance Initial Public Offering Proceeds from initial public offering, net underwriting discount and offering cost Proceeds from Issuance of Common Stock Proceeds from issuance of common stock Payments for Repurchase of Preferred Stock and Preference Stock Payments for repurchase of preferred stock Payments for repurchase of preferred stock Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefit from stock-based compensation Excess tax benefit from stock-based compensation Proceeds From Issuance of Preferred Stock, Net of Issuance Costs Proceeds from issuance of preferred stock, net of issuance costs Payments for Repurchase of Common Stock Payments for repurchase of common stock Payments for repurchase of common stock Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Effect of Exchange Rate on Cash and Cash Equivalents Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents, Total Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Income Taxes Paid Cash paid for taxes Supplemental disclosure of noncash investing activities [abstract]. Supplemental Disclosure Of Noncash Investing Activities [Abstract] Supplemental disclosure of noncash investing activities Issuance of equity in connection with acquisitions. Issuance of Equity in Connection With Acquisitions Issuance of equity in connection with acquisitions Other noncash consideration in connection with acquisitions. Other Noncash Consideration in Connection with Acquisitions Other noncash consideration in connection with acquisitions Supplemental disclosure of noncash financing activities [abstract]. Supplemental Disclosure Of Noncash Financing Activities [Abstract] Supplemental disclosure of noncash financing activities Conversion of preferred stock to common shares. Conversion of Preferred Stock to Common Shares Conversion of preferred stock to common shares Reclassification of restricted stock liability to additional paid-in capital. Reclassification of Restricted Stock Liability to Additional Paid-in Capital Reclassification of restricted stock liability to additional paid-in capital Description Of Business [Abstract] Description of Business [Text Block], Description Of Business Summary Of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary Of Significant Accounting Policies Business Combinations [Abstract] Business Combination Disclosure [Text Block] Business Combinations Goodwill And Other Intangible Assets [Abstract] Goodwill and Intangible Assets Disclosure [Text Block] Goodwill And Other Intangible Assets Property And Equipment, Net [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property And Equipment, Net Accrued Expenses [Abstract] Schedule of Accrued Liabilities [Table Text Block] Accrued Expenses Commitments And Contingencies [Abstract] Commitments and Contingencies, [Text Block], Commitments and Contingencies Commitments And Contingencies Preferred stock redeemable preferred stock and convertible redeemable preferred stock [abstract]. Preferred Stock, Redeemable Preferred Stock And Convertible Redeemable Preferred Stock [Abstract] Preferred stock, redeemable preferred stock and convertible redeemable preferred stock [text block]. Preferred Stock, Redeemable Preferred Stock And Convertible Redeemable Preferred Stock [Text Block] Preferred Stock, Redeemable Preferred Stock And Convertible Redeemable Preferred Stock Stockholders' Equity And Stock-Based Compensation [Abstract] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity And Stock-Based Compensation