Document and Entity Information [Abstract] 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 reserves of $13 and $17 at September 30, 2011 and December 31, 2010 , respectively) Accounts Receivable, Net, Current Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, 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 Other assets Other Assets, Noncurrent Acquired intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill 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 9) Commitments and Contingencies Redeemable and convertible preferred stock: Temporary Equity [Abstract] Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Preferred Stock [Member] Redeemable Convertible Preferred Stock [Member] 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, liquidation value Temporary Equity, Liquidation Preference Stockholders' equity (deficit): Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value; 6,000,000 and 0 shares authorized and outstanding at September 30, 2011 and December 31, 2010 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 outstanding Preferred Stock, Shares Outstanding Common stock, $0.01 par value; 45,000,000 and 21,539,370 shares authorized at September 30, 2011 and December 31, 2010, respectively; 25,094,045 and 4,526,603 shares outstanding at September 30, 2011 and December 31, 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 September 30, 2011) Treasury Stock, Value Treasury stock, at cost (2,009 shares at September 30, 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, convertible and redeemable convertible preferred stock, and stockholders' equity (deficit) Total liabilities, convertible and redeemable convertible preferred stock, and stockholders' equity (deficit) Total liabilities, convertible and redeemable 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 and other income, net Nonoperating Gains (Losses) 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 Basic and diluted net loss per share attributable to common stockholders Earnings Per Share, Basic and Diluted Weighted Average Shares Outstanding Basic and Diluted Weighted average number of shares of common stock used in computing basic and diluted net loss per share Weighted average number of shares of common stock used in computing basic and diluted net loss per share Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Adjustments to reconcile net loss to net cash from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation expense Share-based Compensation Re Measurement of Preferred Stock Warrant Liability Re-measurement of preferred stock warrant liability Re-measurement of preferred stock warrant liability Re-measurement of preferred stock warrant liability 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 maturities of 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 used in investing activities Net Cash Provided by (Used in) Investing Activities Net cash 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 exercise of stock options Proceeds from Stock Options Exercised Proceeds from issuance of common stock in connection with initial public offering, net of offering costs 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 and cash equivalents, beginning of period Cash and cash equivalents, end of period Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Conversion of Preferred Stock to Common Stock Conversion of preferred stock to common stock Conversion of preferred stock to common stock Conversion of Preferred Stock Warrant to Common Stock Warrant Conversion of preferred stock warrant to common stock warrant Conversion of preferred stock warrant to common stock warrant Accretion of Redeemable Convertible Preferred Stock Non Cash Investing and Financing Activities Accretion of redeemable convertible preferred stock Accretion of redeemable convertible preferred 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] Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) [Abstract] Comprehensive Income (Loss) [Abstract] Net Loss per Share Earnings Per Share [Text Block] Net Loss Per Share [Abstract] Net Loss Per Share [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Fair Value of Financial Instruments [Abstract] Fair Value of Financial Instruments [Abstract] Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses [Abstract] Accrued Expenses [Abstract] Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-based Compensation [Abstract] Stock-based Compensation [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] Revolving Credit Facility Short-term Debt [Text Block] Revolving Credit Facility [Abstract] Revolving Credit Facility [Abstract] Intangible Assets and Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Intangible Assets and Goodwill [Abstract] Intangible Assets and Goodwill [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] 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 Document Fiscal Period Focus Document Fiscal Year Focus Condensed Consolidated Balance Sheets [Abstract] Condensed Consolidated Statements of Operations [Abstract] Condensed Consolidated Statements of Cash Flows [Abstract]