Document and Entity Information [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments Short-term Investments Accounts receivable, net of allowance Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current, Total Total current assets Property and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Acquired intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other Assets Other Assets, Noncurrent Total assets Assets, Total Total assets LIABILITIES, REDEEMABLE AND CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) Liabilities Temporary Equity and Stockholder Equity Abstract LIABILITIES, REDEEMABLE AND CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Accrued Liabilities, Current Current portion of deferred revenue Deferred Revenue, Current Total current liabilities Liabilities, Current, Total Total current liabilities Deferred revenue, net of current portion Deferred Revenue, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Commitments and contingencies (Note 11) Commitments and Contingencies Redeemable and convertible preferred stock: Temporary Equity [Abstract] Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Preferred Stock [Member] Preferred Stock Redeemable Convertible Preferred Stock [Member] Redeemable Convertible Preferred Stock Statement [Line Items] Redeemable convertible preferred stock Temporary Equity, Carrying Amount Redeemable convertible preferred stock series A-2, par value Temporary Equity, Par or Stated Value Per Share Redeemable convertible preferred stock series A-2, shares authorized Temporary Equity, Shares Authorized Redeemable convertible preferred stock series A-2, shares issued Temporary Equity, Shares Issued Redeemable convertible preferred stock series A-2, shares outstanding Temporary Equity, Shares Outstanding Convertible Preferred Stock [Member] Convertible Preferred Stock Convertible preferred stock, liquidation value Temporary Equity, Liquidation Preference Stockholders' equity (deficit): Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value; 6,000,000 shares authorized at December 31, 2011; no shares issued Preferred Stock, Value, Issued Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Common stock, $0.01 par value; 45,000,000 and 21,539,370 shares authorized at December 31, 2011 and 2010, respectively; 25,137,342 and 4,526,603 shares outstanding at December 31, 2011 and 2010, respectively Common Stock, Value, Issued Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares outstanding Common Stock, Shares, Outstanding Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Treasury stock, at cost (2,009 shares at December 31, 2011) Treasury Stock, Value Treasury stock, at cost (2,009 shares at December 31, 2011) Treasury stock, shares Treasury Stock, Shares Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity (deficit) Stockholders' Equity Attributable to Parent, Total Total stockholders' equity (deficit) Liabilities Temporary Equity and Stockholders Equity Total liabilities, redeemable and convertible preferred stock, and stockholders' equity (deficit) Total liabilities, redeemable and convertible preferred stock, and stockholders' equity (deficit) Total liabilities, redeemable and convertible preferred stock, and stockholders' equity (deficit) Revenue Revenues Cost of revenue Cost of Revenue Gross profit Gross Profit Gross profit Operating expenses: Operating Expenses [Abstract] Research and development Research and Development Expense General and administrative General and Administrative Expense Sales and marketing Selling and Marketing Expense Total operating expenses Operating Expenses, Total Total operating expenses Loss from operations Operating Income (Loss) Loss from operations Interest income Investment Income, Interest Interest expense Interest Expense Interest expense Other expenses, net Other Nonoperating Income (Expense) Loss before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Loss before income taxes Provision for income taxes Income Tax Expense (Benefit) Provision for income taxes Net loss Net Income (Loss) Attributable to Parent Net loss Accretion of redeemable convertible preferred stock Temporary Equity, Accretion to Redemption Value Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Net loss attributable to common stockholders Net loss attributable to common stockholders per share--basic and diluted Earnings Per Share, Basic and Diluted Weighted Average Shares Outstanding Basic and Diluted Weighted-average number of common shares used in computing net loss per share--basic and diluted Weighted-average number of common shares used in computing net loss per share--basic and diluted Series A-2 Redeemable Convertible Preferred Stock Number of Shares Series A2Redeemable Convertible Preferred Stock [Member] Series A-2 Redeemable Convertible Preferred Stock Number of Shares Balance at December 31, 2008, shares Shares, Outstanding Beginning balance, shares Beginning balance Common Stock Additional Paid-in Capital Accumulated Deficit Treasury Stock Accumulated Other Comprehensive Income Issuance of common stock, shares Stock Issued During Period, Shares, New Issues Issuance of common stock Stock Issued During Period, Value, New Issues Issuance of Series D Convertible Preferred Stock Net of Issuance Costs Shares Issuance of Series D convertible preferred stock, net of issuance costs of $76, shares Issuance of Series D convertible preferred stock, net of issuance costs of $76, shares Issuance of Series D Convertible Preferred Stock Net of Issuance Costs Value Issuance of Series D convertible preferred stock, net of issuance costs of $76 Issuance of Series D convertible preferred stock, net of issuance costs of $76 Issuance Cost of Series D Convertible Preferred Stock Issuance cost of Series D convertible preferred stock Issuance cost of Series D convertible preferred stock Issuance of common stock in connection with stock option exercises, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Issuance of common stock in connection with stock option exercises Stock Issued During Period, Value, Stock Options Exercised Accretion of Redeemable Convertible Preferred Stock to Redemption Value Accretion of redeemable convertible preferred stock to redemption value Accretion of redeemable convertible preferred stock to redemption value Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive loss: Comprehensive Loss Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total Total comprehensive loss Ending balance, shares Ending balance Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Repurchase of common stock, shares Stock Repurchased During Period, Shares Repurchase of common stock, shares Repurchase of common stock Stock Repurchased During Period, Value Repurchase of common stock Issuance of Common Stock in Connection with Initial Public Offering Net of Issuance Costs Shares Issuance of common stock in connection with initial public offering, net of issuance costs of $2,995, shares Issuance of common stock in connection with initial public offering, net of issuance costs of $2,995, shares Issuance of Common Stock in Connection with Initial Public Offering Net of Issuance Costs Value Issuance of common stock in connection with initial public offering, net of issuance costs of $2,995 Issuance of common stock in connection with initial public offering, net of issuance costs of $2,995 Issuance Cost of Common Stock in Connection with Initial Public Offering Issuance cost of common stock in connection with initial public offering Issuance cost of common stock in connection with initial public offering Conversion of Redeemable and Convertible Preferred Stock Into Common Stock Upon Close of Initial Public Offering Shares Conversion of redeemable and convertible preferred stock into common stock, shares Conversion of redeemable and convertible preferred stock into common stock, shares Conversion of Redeemable and Convertible Preferred Stock Into Common Stock Upon Close of Initial Public Offering Value Conversion of redeemable and convertible preferred stock into common stock Conversion of redeemable and convertible preferred stock into common stock Adjustments to Additional Paid in Capital Reclassification of Warrant to Purchase Shares of Redeemable and Convertible Preferred Stock Into Warrant to Purchase Common Stock Reclassification of a warrant to purchase shares of redeemable and convertible preferred stock into a warrant to purchase common stock Reclassification of a warrant to purchase shares of redeemable and convertible preferred stock into a warrant to purchase common stock Other Comprehensive Income Unrealized Holding Gain Loss Arising During Period Net of Tax Unrealized loss on available-for-sale marketable securities Unrealized loss on available-for-sale marketable securities Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of Premium on Investments Amortization of premium on investments Amortization of premium on investments Share-based compensation expense Share-based Compensation Re Measurement of Preferred Stock Warrant Liability Warrant remeasurement Warrant remeasurement Warrant remeasurement Changes in assets and liabilities, net of acquisition: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Accounts receivable Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Other assets Increase (Decrease) in Other Operating Assets Other assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses Increase (Decrease) in Accrued Liabilities Other long-term liabilities Increase (Decrease) in Other Noncurrent Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities Investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Proceeds from short-term investments Proceeds from Sale of Short-term Investments Purchases of short-term investments Payments to Acquire Short-term Investments Purchases of short-term investments Payment for acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Payment for acquisition, net of cash acquired Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of preferred stock, net of issuance costs Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from issuance of common stock pursuant to exercise of stock options Proceeds from Stock Options Exercised Net proceeds from issuance of common stock Proceeds from Issuance of Common Stock Repurchase of common stock Payments for Repurchase of Common Stock Repurchase of common stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of currency exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash Cash, beginning of period Cash, end of period Non cash investing and financing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Accretion of redeemable convertible preferred stock Acquisition of Property and Equipment Included in Accounts Payable Acquisition of property and equipment included in accounts payable Acquisition of property and equipment included in accounts payable Conversion of Redeemable and Convertible Preferred Stock to Common Stock Conversion of redeemable and convertible preferred stock to common stock Conversion of redeemable and convertible preferred stock to common stock Conversion of Warrant to Purchase Convertible Preferred Stock to Warrant to Purchase Common Stock Conversion of a warrant to purchase convertible preferred stock to a warrant to purchase common stock Conversion of a warrant to purchase convertible preferred stock to a warrant to purchase common stock Nature of Business Nature of Operations [Text Block] Nature of Business [Abstract] Nature of Business [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] Net Loss per Share Earnings Per Share [Text Block] Net Loss Per Share [Abstract] Net Loss Per Share [Abstract] Cash Equivalents Short Term Investments and Fair Value Disclosures [Text Block] Short-term Investments and Fair Value of Financial Instruments Short-term Investments and Fair Value of Financial Instruments Short-term Investments and Fair Value of Financial Instruments [Abstract] Short-term Investments and Fair Value of Financial Instruments [Abstract] Short-term Investments and Fair Value of Financial Instruments Acquisition, Goodwill, and Acquired Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Acquisition, Goodwill, and Acquired Intangible Assets [Abstract] Acquisition, Goodwill, and Acquired Intangible Assets [Abstract] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Property and Equipment [Abstract] Property and Equipment [Abstract] Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses [Abstract] Accrued Expenses [Abstract] Redeemable and Convertible Preferred Stock and Stockholders' Equity (Deficit) Stockholders' Equity Note Disclosure [Text Block] Redeemable and Convertible Preferred Stock and Stockholders' Equity (Deficit) [Abstract] Redeemable and Convertible Preferred Stock and Stockholders' Equity (Deficit) [Abstract] Stock-based Awards Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-based Awards [Abstract] Stock-based Awards [Abstract] Income Taxes Income Tax Disclosure [Text Block] Income Taxes [Abstract] Income Taxes [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies [Abstract] Commitments and Contingencies [Abstract] Retirement Plan Pension and Other Postretirement Benefits Disclosure [Text Block] Retirement Plan [Abstract] Retirement Plan [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Revolving Credit Facility Short-term Debt [Text Block] Revolving Credit Facility [Abstract] Revolving Credit Facility [Abstract] Quarterly information (Unaudited) Quarterly Financial Information [Text Block] Quarterly information (Unaudited) [Abstract] Quarterly information (Unaudited) [Abstract] Amendment Flag Current Fiscal Year End Date Document Period End Date Document Type Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Public Float Document Fiscal Period Focus Document Fiscal Year Focus Consolidated Balance Sheets [Abstract] Consolidated Statements of Operations [Abstract] Consolidated Statements of Redeemable and Convertible Preferred Stock and Stockholders' Equity (Deficit) and Comprehensive Loss [Abstract] Consolidated Statements of Cash Flows [Abstract]