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 Current Reporting Status Entity Voluntary Filers Entity Public Float Consolidated Balance Sheets [Abstract] Assets [Abstract] Assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Short-term Investments* Short-term Investments, Total Short-term investments Restricted Cash and Investments Restricted Cash and Investments, Total Restricted cash Accounts Receivable, Net Accounts Receivable, Net, Total Accounts receivable Prepaid Expense and Other Assets Prepaid Expense and Other Assets, Total Prepaid expenses and other current assets Deferred Tax Assets, Net Deferred Tax Assets, Net, Total Deferred tax assets Assets, Current Total current assets Carrying amount of finite-lived patent assets after accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights. Patent Assets Net Patent assets, net PropertyPlantAndEquipmentNet Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Other Assets, Noncurrent, Total Property and equipment, net Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions and sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Goodwill And Intangible Assets Net Goodwill and intangible assets, net Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Deferred Tax Assets, Net, Noncurrent Deferred tax assets, less current portion Deferred Tax Assets, Net, Noncurrent, Total Other Assets, Noncurrent Other Assets, Noncurrent, Total Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities, redeemable convertible preferred stock and stockholders' equity Accounts Payable Accounts Payable, Total Accounts payable Accrued And Other Liabilities,net Accrued Liabilities, Current, Total Accrued liabilities Deferred Revenue, Current Deferred revenue, current , Current, Total Other Liabilities, Current Other Liabilities, Current, Total Notes payable and other obligations, current Other Sundry Liabilities, Current Other current liabilities Liabilities, Current Total current liabilities Total current liabilities Deferred Revenue, Noncurrent Deferred Revenue, Noncurrent, Total Deferred revenue, less current portion Deferred Tax Liabilities Deferred Tax Liabilities, Total Deferred tax liabilities Other Liabilities, Noncurrent Other Liabilities, Noncurrent, Total Notes payable and other obligations, less current portion Other Liablilities Liabilities, Other than Long-term Debt, Noncurrent, Total Other liabilities Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 12) Temporary Equity, Carrying Amount Temporary Equity, Carrying Amount, Ending Balance Temporary Equity, Carrying Amount, Beginning Balance Temporary Equity, Carrying Amount, Total Redeemable convertible preferred stock, $0.0001 par value - 10,000 and 26,230 shares authorized: 0 and 26,230 issued and outstanding as of December 31, 2011 and 2010, respectively; aggregate liquidation preference of $0 and $64,361 as of December 31, 2011 and 2010, respectively Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common stock, $0.0001 par value - 200,000 and 60,000 shares authorized: 49,145 and 11,432 issued and 49,145 and 10,944 outstanding as of December 31, 2011 and 2010, respectively Additional Paid in Capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Total Additional paid-in capital Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Retained earnings Stockholders' Equity Attributable to Parent Balance Balance Balance Total stockholders' equity Total stockholders' equity (deficit) Liabilities and Equity Total liabilities, redeemable convertible preferred stock and stock holders' equity Preferred Stock, Par or Stated Value Per Share Redeemable convertible preferred stock, par value Temporary Equity, Shares Authorized Redeemable convertible preferred stock, shares authorized Temporary Equity, Shares Issued Redeemable convertible preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Redeemable convertible preferred stock, shares outstanding Temporary Equity, Liquidation Preference Redeemable convertible 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, Total Common stock, shares issued Common Stock, Shares, Outstanding Balance, shares Balance, shares Balance, shares Common stock, shares outstanding Consolidated Statements Of Operations [Abstract] Revenues Revenues, Total Revenue Cost of Revenue Cost of Revenue, Total Cost of revenue Selling, General and Administrative Expense Selling, General and Administrative Expense, Total Selling, general and administrative expenses Loss on Sale of Patent Assets, net. Loss on Sale of Patent Assets, Net Loss on sale of patent assets, net Loss on sale of patent assets, net Loss on sale of patent assets, net Operating Income (Loss) Operating income Interest Income, Nonoperating. Interest income Interest and Other Income, Total Other Operating Income (Expense), Net Other income (expense), net Other Nonoperating Income (Expense), Total Interest Expense Interest expense Interest Expense, Total Interest expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before provision for (benefit from) income taxes Income Tax Expense (Benefit) Income Tax Expense (Benefit), Total Provision for (benefit from) income taxes Net Income (Loss) Attributable to Parent Net income Net income Net income Undistributed Earnings Allocated to Participating Securities Less: allocation of net income to participating stockholders Net Income (Loss) Available to Common Stockholders, Basic Net income available to common stockholders - basic Undistributed earnings re-allocated to common stockholders to reflect the impact of the diluted securities. Undistributed Earnings Re-Allocated to Common Stockholders Undistributed earnings re-allocated to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Net income available to common stockholders - diluted Net income available to common stockholders-diluted Net Income Attributable To Common Stockholders And Net Income Per Share[Abstract] Net income per common share: Earnings Per Share, Basic Earnings Per Share, Basic, Total Basic Earnings Per Share, Diluted Earnings Per Share, Diluted, Total Diluted Weighted average shares used in per common share calculation: Weighted-average shares used in per common share calculation: Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic, Total Basic Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Diluted Consolidated Statements Of Redeemable Convertible Preferred Stock And Stockholders' Equity (Deficit) [Abstract] Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Preferred Stock [Member] Preferred Stock [Member] Series B redeemable convertible preferred stock. Series B Redeemable Convertible Preferred Stock [Member] Series B Redeemable Convertible Preferred Stock [Member] Series C redeemable convertible preferred stock. Series C Redeemable Convertible Preferred Stock [Member] Series C Redeemable Convertible Preferred Stock [Member] 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] Retained Earnings [Member] Retained Earnings (Accumulated Deficit) [Member] Shares, Outstanding Balance, shares Balance, shares Balance, shares Stock Issued During Period, Value, Other Issuance of redeemable convertible preferred stock Stock Issued During Period, Shares, Other Issuance of redeemable convertible preferred stock, shares Vesting of stock options early exercised. Vesting of Stock Options Early Exercised Vesting of stock options early exercised Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Total Stock Issued During Period, Value, Purchase of Assets Issuance of common stock in exchange for assets Stock Issued During Period, Shares, Purchase of Assets Issuance of common stock in exchange for assets, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock upon early exercise of options ,shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total Stock Repurchased During Period, Value Repurchase of common stock Repurchase of common stock Stock Repurchased During Period, Shares Repurchase of common stock, shares Repurchase of common stock, shares Stock Issued During Period, Value, New Issues Issuance of common stock Stock Issued During Period, Shares, New Issues Issuance of common stock, shares Stock issued during period, value, follow on offering. Stock Issued During Period, Value, Follow on Offering Issuance of common stock follow on offering Stock issued during period, shares, follow on offering. Stock Issued During Period, Shares, Follow on Offering Issuance of common stock follow on offering, shares Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other common stock issuances Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other common stock issuances, shares Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments Conversion of preferred stock into shares of common stock Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments, Total Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of preferred stock into shares of common stock, shares Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Tax benefit of equity award deductions Adjustments to Additional Paid in Capital, Other Other Subsidiary, Sale of Stock [Axis] Sale Of Stock Name Of Transaction [Domain] Sale of Stock, Name of Transaction [Domain] I P O [Member] Initial Public Offering [Member] Secondary offering. Secondary Offering [Member] Secondary Offering [Member] Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Stock issued, issuance costs Sale of Stock, Price Per Share Issuance of common stock, issue price 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, Depletion and Amortization Depreciation, Depletion and Amortization, Total Depreciation and amortization Share-based Compensation Stock-based compensation Share-based Compensation, Total Stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefit from stock-based compensation Excess tax benefit from stock-based compensation Imputed interest on other obligations. Imputed Interest On Other Obligations Imputed interest on other obligations Investment Income, Amortization of Premium Amortization of premium on investments Valuation Allowance, Deferred Tax Asset, Change in Amount Reversal of deferred tax valuation allowance Reversal of deferred tax valuation allowance Increase (Decrease) in Deferred Income Taxes Deferred taxes Deferred Income Tax Expense (Benefit), Total Deferred taxes Other Operating Activities, Cash Flow Statement Other Other Noncash Income (Expense), Total Other Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities (net of effect of acquisitions): Increase (Decrease) in Accounts Receivable Accounts receivable Accounts receivable Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Prepaid expenses and other assets Increase (Decrease) in Accounts Payable Increase (Decrease) in Accounts Payable, Total Accounts payable Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued and other liabilities Increase (Decrease) in Deferred Revenue Deferred revenue Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing actives Increase (Decrease) in Restricted Cash Decrease (increase) in restricted cash Increase in restricted cash Increase in restricted cash Payments to Acquire Available-for-sale Securities Purchases of investments classified as available-for-sale Payments to Acquire Available-for-sale Securities, Total Purchase of investments classified as available-for-sale Proceeds from Sale and Maturity of Available-for-sale Securities Proceeds from Sale and Maturity of Available-for-sale Securities, Total Maturities of investments classified as available-for-sale Business Acquisition Business acquisitions Payments to Acquire Businesses, Net of Cash Acquired, Total Business acquisition Payments to Acquire Intangible Assets Purchases of intangible assets Acquisition of patent assets, net Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment, Total Purchases of property and equipment Acquisitions of patent assets. Acquisitions of Patent Assets Acquisitions of patent assets Acquisitions of patent assets Proceeds from Sale of Intangible Assets Proceeds from sale of patent assets Proceeds from sale of patent assets 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 Repayments of principal on notes payable and other obligations. Repayments of Principal on Notes Payable and Other Obligations Repayments of principal on notes payable and other obligations Repayments of principal on notes payable and other obligations Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs Proceeds from Issuance Initial Public Offering Proceeds from issuance of common stock in initial public offering, net of issuance costs Proceeds from issuance of common stock in initial public offering, net of issuance costs Proceeds from Issuance of Common Stock Proceeds from issuance of common stock in follow-on offering, net of issuance costs Proceeds from exercise of stock options and other common stock issuances Proceeds from Stock Options Exercised Proceeds from exercise of stock options and other common stock issuances Payments for Repurchase of Common Stock Payments for the purchase of common stock Payments for the purchase of common stock Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefit from stock-based compensation Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net increase in cash and cash equivalents Supplemental Cash Flow Elements [Abstract] Supplemental disclosures of cash flow information Interest Paid Cash paid for interest Interest Paid, Total Income Taxes Paid, Net Cash paid for income taxes Income Taxes Paid, Net, Total Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash investing and financing activities Conversion Of Redeemable Convertible Preferred Stock To Common Stock Conversion of redeemable convertible preferred stock to common stock Patent assets purchased or financed through notes payable or other obligations. Patent Assets Purchased or Financed Through Notes Payable or other Obligations Patent assets purchased or financed through notes payable or other obligations Adjustments to patent asset purchase price and related liability. Adjustments to Patent Asset Purchase Price and Related Liability Adjustments to patent asset purchase price and related liability Patent assets acquired through settlement of notes receivable. Patent Assets Acquired Through Settlement of Notes Receivable Patent assets received in barter transactions Change in patent assets purchased and accrued but not paid. Change in Patent Assets Purchased and Accrued But Not Paid Change in patent assets purchased and accrued but not paid Intangible assets received in barter transactions. Intangible Assets Received In Barter Transactions Intangible assets received in barter transactions Cost related to public offerings. Cost Related to Public Offerings Change in initial public offering-related costs accrued but not paid Summary Of The Business [Abstract] Nature of Operations [Text Block] Summary Of The Business Significant Accounting Policies[Abstract] Significant Accounting Policies [Text Block] Significant Accounting Policies Earnings Per Share [Text Block] Net Income Attributable To Common Stockholders And Net Income Per Share Fair Value Measurements [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Investments [Abstract] Investment [Text Block] Investments Patent Assets[Abstract] Patent assets. Patent Assets [Text Block] Patent Assets Goodwill And Intangible Assets, Net [Abstract] Goodwill and Intangible Assets Disclosure [Text Block] Goodwill And Intangible Assets, Net Property And Equipment, Net [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property And Equipment, Net Accrued And Other Current Liabilities Abstract. Accrued And Other Current Liabilities [Abstract] Accrued and other liabilities disclosure [Text Block]. Accrued and Other Liabilities Disclosure [Text Block] Accrued And Other Current Liabilities Notes Payable And Other Obligations [Abstract] Notes payable and other obligations disclosure [Text Block]. Notes Payable and Other Obligations Disclosure [Text Block] Notes Payable And Other Obligations Lines Of Credit [Abstract] Debt Disclosure [Text Block] Lines Of Credit Commitments And Contingencies [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments And Contingencies Common Stock [Abstract] Common stock [text block]. Common Stock [Text Block] Common Stock Preferred Stock [Abstract]