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 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, less current portion 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 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, Total Other Long-term Debt, Current Deferred payment obligations Other Liabilities, Current Other current liabilities Other Liabilities, Current, Total Notes payable and other obligations, current 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 Liablilities Liabilities, Other than Long-term Debt, Noncurrent, Total Other liabilities Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 12) 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 shares authorized: 50,090 and 49,145 shares issued and outstanding as of March 31, 2012 and December 31, 2011, 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 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 Stockholders' Equity Attributable to Parent Balance Balance Balance Total stockholders' equity Total stockholders' equity (deficit) Liabilities and Equity Total liabilities and stockholders' equity 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 Gain (loss) on sale of patent assets, net. Gain (Loss) on Sale of Patent Assets, Net (Gain) on sale of patent assets, net Gain on sale of patent assets Gain on sale of patent assets, net Gain on sale of patent assets Operating Income (Loss) Operating income Interest Income, Nonoperating. Interest income Interest and Other Income, Total Other Nonoperating Expense Interest and other expense, net Interest and other expense, net Other Nonoperating Expense, Total Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before provision for income taxes Income Tax Expense (Benefit) Income Tax Expense (Benefit), Total Provision for income taxes Net Income (Loss) Attributable to Parent Net income Net income Net income Net income (loss) available to common stockholders. Net Income (Loss) Available to Common Stockholders [Abstract] Net income available to common stockholders: Net Income (Loss) Available to Common Stockholders, Basic Basic Net income available to common stockholders - basic Net Income (Loss) Available to Common Stockholders, Diluted Net income available to common stockholders - diluted Diluted Net Income Available To Common Stockholders [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 computing net income per common share: 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 Comprehensive Income [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized holding gains arising during the period Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax Less: reclassification adjustment for gains included in net income Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net unrealized gains on available-for-sale securities Other Comprehensive Income (Loss), Net of Tax Other comprehensive income, net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 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, 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 deferred payment obligations. Imputed Interest on Deferred Payment Obligations Imputed interest on deferred payment obligations Investment Income, Amortization of Premium Amortization of premium on investments 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: 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 activities 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 and sale of investments classified as available-for-sale Increase (Decrease) in Restricted Cash Decrease in restricted cash Increase in restricted cash Increase in restricted cash 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 Other Debt Repayments of principal on deferred payment obligations Payments of Stock Issuance Costs Initial public offering-related costs Initial public offering-related costs Proceeds from Stock Options Exercised Proceeds from exercise of stock options and other common stock issuances 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 decrease in cash and cash equivalents Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash investing and financing activities 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 Incurred offering costs that are not paid as of period end. Cost Related to Public Offerings Initial public offering-related costs accrued but not paid Nature Of Business [Abstract] Nature of Operations [Text Block] Nature Of Business Summary Of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary Of Significant Accounting Policies Earnings Per Share [Text Block] Net Income Available To Common Stockholders Fair Value Measurements [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Short-Term Investments [Abstract] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Short-Term Investments Patent Assets, Net [Abstract] Patent assets. Patent Assets [Text Block] Patent Assets, Net Property And Equipment, Net [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property And Equipment, Net Goodwill And Intangible Assets, Net [Abstract] Goodwill and Intangible Assets Disclosure [Text Block] Goodwill And Intangible Assets, 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 Deferred payment obligations. Deferred Payment Obligations [Abstract] Deferred payment obligations. Deferred Payment Obligations [Text Block] Deferred Payment Obligations Lines Of Credit [Abstract] Debt Disclosure [Text Block] Deferred Payment Obligations Lines Of Credit Commitments And Contingencies [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments And Contingencies Stockholders' Equity [Abstract] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Related-Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related-Party Transactions Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Segment Reporting Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events