Balance Sheet Parenthetical [Abstract] Balance Sheet Parenthetical [Abstract] Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding 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 Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Treasury stock, 36,020 and 34,716 shares of common held at cost Treasury Stock, Shares Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float EQUITY TRANSACTIONS: [Abstract] EQUITY TRANSACTIONS: [Abstract] Dividends Declared [Table Text Block] Dividends Declared [Table Text Block] INCOME TAXES: [Abstract] INCOME TAXES: [Abstract] Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Domain] BIO-key [Member] BIO-key [Member] BIO-key [Member] DDD [Member] DDD [Member] DDD [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Expenses from Transactions with Related Party Investment Owned, Balance, Shares Investment Owned, Balance, Shares Investment Owned, at Fair Value Investment Owned, at Fair Value Property and Equipment [Abstract] Property and Equipment [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Machinery and Equipment [Member] Machinery and Equipment [Member] Leasehold Improvements [Member] Leasehold Improvements [Member] Building [Member] Building [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Useful Life, Minimum Property, Plant and Equipment, Useful Life Land Land Building and improvements Buildings and Improvements, Gross Engineering and test equipment Machinery and Equipment, Gross Computer Equipment And Software Gross Computer Equipment And Software Gross Carrying amount as of the balance sheet date of long lived, depreciable assets that are used in the creation, maintenance and utilization of information systems, capitalized costs of purchased software applications, and capitalized costs of computer equipment and hardware Furniture and fixtures Furniture and Fixtures, Gross Leasehold improvements Leasehold Improvements, Gross Property and equipment, gross Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Property, Plant and Equipment, Net Depreciation Depreciation Capitalized Computer Software, Amortization Capitalized Computer Software, Amortization Capitalized Computer Software, Accumulated Amortization Capitalized Computer Software, Accumulated Amortization Capitalized Computer Software, Net Capitalized Computer Software, Net Sale Leaseback Transaction, Historical Cost Sale Leaseback Transaction, Net Proceeds, Investing Activities Sale Leaseback Transaction, Cumulative Gain Recognized Sale Leaseback Transaction, Cumulative Gain Recognized Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Condensed Consolidated Statements of Income [Abstract] Condensed Consolidated Statements of Income [Abstract] Statement [Table] Statement [Table] Royalty Revenue [Axis] Royalty Revenue [Axis] Royalty Revenue [Axis] Royalty Revenue [Domain] Royalty Revenue [Domain] [Domain] for Royalty Revenue [Axis] Statement, Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] REVENUES Revenues [Abstract] Technology Services Revenue Technology Services Revenue Revenues Revenues REVENUES Licenses Revenue Sales Revenue, Goods, Net Sales Revenue, Goods, Net OPERATING EXPENSES: Operating Expenses [Abstract] Patent administration and licensing Patent administration and licensing Patent administration and licensing expenses. Expenses (ie. legal, filings, etc.) incurred and are directly related to generating license revenue. Development Expense Research and Development Expense Selling, general and administrative Selling, General and Administrative Expense Repositioning Restructuring Charges Total Operating Expenses Costs and Expenses Income from operations Operating Income (Loss) OTHER INCOME: Other Income and Expenses [Abstract] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest INCOME TAX PROVISION Income Tax Expense (Benefit) NET INCOME Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest NET INCOME PER COMMON SHARE — BASIC Earnings Per Share, Basic WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — BASIC Weighted Average Number of Shares Outstanding, Basic NET INCOME PER COMMON SHARE — DILUTED Earnings Per Share, Diluted WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — DILUTED Weighted Average Number of Shares Outstanding, Diluted Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared BACKGROUND [Abstract] BACKGROUND [Abstract] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Severance Costs Severance Costs COMPENSATION PLANS AND PROGRAMS [Abstract] COMPENSATION PLANS AND PROGRAMS [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 401(k) and Profit Sharing [Member] 401(k) and Profit Sharing [Member] 401(k) and Profit Sharing [Member] 2009 Plan [Domain] 2009 Plan [Domain] 2009 Plan [Domain] Prior Plan [Domain] Prior Plan [Domain] Prior Plan [Domain] 2017 Plan [Domain] 2017 Plan [Domain] 2017 Plan [Domain] Award Type [Axis] Award Type [Axis] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name Equity Award [Domain] Stock Options Outstaning which have an Indefinite Contractual Term [Member] Stock Options Outstaning which have an Indefinite Contractual Term [Member] Cash from stock options [Member] Cash from stock options [Member] Cash from stock options [Member] Restricted Stock Units (RSU) and/or Restricted Stock [Member] Restricted Stock Units RSU and or Restricted Stock [Member] Restricted stock units (RSUs) as awarded by a company to their employees as a form of incentive compensation. Incremental common shares attributable to unvested restricted stock that were not included in diluted earnings per share (EPS) because to do so would increase EPS amounts or decrease loss per share amounts for the period presented. Restricted stock are shares of stock for which sale is contractually or governmentally restricted for a given period of time. Employee Stock Option [Member] Employee Stock Option [Member] Employment Level [Axis] Employment Level [Axis] Employment Level [Domain] Employment Level [Domain] Employment Level [Domain] Share-based Compensation Arrangement by Share-based Payment Award and Other Compensation Benefits [Line Items] [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures Stock Issued During Period, Shares, Share-based Compensation, Forfeited Stock Issued During Period, Shares, Share-based Compensation, Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Equity Available for Grant [Roll Forward] Equity Available for Grant [Roll Forward] Equity Available for Grant [Roll Forward] Equity Instruments Available for Grant as of December 31, 2010 Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant RSUs granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Options Expired and RSUs cancelled ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeituresAndExpirationsInPeriod For presentations that combine terminations, the number of shares under equity instruments that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option or RSUs plan or that expired. Equity Instruments Available for Grant as of December 31, 2011 Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Minimum Exercise Price Per Share Options Minimum Exercise Price Per Share Options Exercise price per share of each option, other than in the event of options granted in connection with a merger or other acquisition, cannot be less than fair market value of a share of common stock on the date of grant. Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Stock Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding Options, as of December 31, 2010 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Outstanding Options, as of December 31, 2011 Weighted Average Excercise Price, as of December 31, 2010 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Cancellations in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted Average Exercise Price, as of December 31, 2011 Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Intrinsic Value of Stock Options Exercised During Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Stock Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Proceeds from Stock Options Exercised Proceeds from Stock Options Exercised Excess Tax Benefit from Share-based Compensation, Financing Activities Excess Tax Benefit from Share-based Compensation, Financing Activities Vested in Period, Total Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Proceeds From Stock Options If Exercised Proceeds From Stock Options If Exercised Options with exercise price less than Fair Market Value of our stock. The cash inflow associated with the amount received from holders had they exercised their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] RSUs granted RSUs, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value RSUs, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights Share-based Compensation Share-based Compensation Other than Temporary Impairment Losses, Investments Other than Temporary Impairment Losses, Investments Other Postretirement Benefits Cost (Reversal of Cost) Defined Contribution Plan, Cost Defined Benefit Plan, Plan Assets, Contributions by Employer Defined Benefit Plan, Plan Assets, Contributions by Employer Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Condensed Consolidated Statements of Cash Flows [Abstract] Condensed Consolidated Statements of Cash Flows [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Supplemental Cash Flow Information [Axis] Supplemental Cash Flow Information [Axis] Supplemental Cash Flow Information [Axis] Property, Plant and Equipment, Type [Domain] Patents [Member] Patents [Member] Accrued Capitalized Patent Costs Accrued Capitalized Patent Costs Accrued Capitalized Patent Costs NET INCOME Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Multiple Element Arrangements [Abstract] [Abstract] Multiple Element Arrangements [Abstract] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Amortization of Financing Costs and Discounts Amortization of Debt Issuance Costs and Discounts Recognition of Deferred Revenue Recognition of Deferred Revenue Increase in deferred revenue Increase (Decrease) in Deferred Revenue Increase (Decrease) in Deferred Income Taxes Increase (Decrease) in Deferred Income Taxes Restructuring Charges Other Noncash Expense Other Noncash Expense Gain (Loss) on Disposition of Assets Gain (Loss) on Disposition of Assets Other Operating Activities, Cash Flow Statement Other Operating Activities, Cash Flow Statement Decrease (increase) in assets: Increase (Decrease) in Operating Assets [Abstract] Increase (Decrease) in Receivables Increase (Decrease) in Receivables Deferred charges and other current assets Increase (Decrease) in Other Operating Assets Increase (decrease) in liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Increase (Decrease) in Accounts Payable Increase (Decrease) in Accounts Payable Accrued taxes payable Increase (Decrease) in Accrued Taxes Payable Other accrued expenses Increase (Decrease) in Other Accrued Liabilities Net Cash Provided by (Used in) Investing Activities [Abstract] Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of short-term investments Payments to Acquire Short-term Investments Sales of short-term investments Proceeds from Sale of Short-term Investments Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Capitalized patent costs Capitalized patent costs Capitalized costs inccured and are direclty related to the defense and generation of Patents. Payments to Acquire Intangible Assets Payments to Acquire Intangible Assets Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Payments for (Proceeds from) Long-term Investments Payments for (Proceeds from) Long-term Investments Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Net Cash Provided by (Used in) Financing Activities [Abstract] Net proceeds from exercise of stock options Proceeds from Convertible Debt Proceeds from Convertible Debt Repayments of Long-term Debt Repayments of Long-term Debt Proceeds from (Payments for) Other Financing Activities Proceeds from (Payments for) Other Financing Activities Proceeds from Hedge, Financing Activities Proceeds from Hedge, Financing Activities Payments on long-term debt, including capital lease obligations Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Dividends paid Payments of Dividends Payments Related to Tax Withholding for Share-based Compensation Payments Related to Tax Withholding for Share-based Compensation Proceeds from Issuance of Warrants Proceeds from Issuance of Warrants Payments of debt issuance costs Payments of Debt Issuance Costs Proceeds from Noncontrolling Interests Proceeds from Noncontrolling Interests 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 Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS, END OF PERIOD Cash and Cash Equivalents, at Carrying Value Interest Paid Interest Paid Income taxes paid, including foreign witholding taxes Income Taxes Paid Dividends Payable Dividends Payable Other Significant Noncash Transaction, Value of Consideration Received Other Significant Noncash Transaction, Value of Consideration Received Excess Tax Benefit from Share-based Compensation, Operating Activities Excess Tax Benefit from Share-based Compensation, Operating Activities Share Repurchases [Abstract] Share Repurchases [Abstract] Accelerated Share Repurchases [Table] Accelerated Share Repurchases [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Equity [Member] Equity [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] 2014 Repurchase Program [Domain] 2014 Repurchase Program [Domain] 2014 Repurchase Program [Domain] [Domain] 2012 Repurchase Program [Domain] 2012 Repurchase Program [Domain] 2012 Repurchase Program [Domain] 2009 Repurchase Program [Domain] 2009 Repurchase Program [Domain] 2009 Repurchase Program [Domain] 2014 Repurchase Program [Member] 2014 Repurchase Program [Member] 2014 Repurchase Program [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Convertible Debt [Member] Convertible Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Note Warrant [Member] Note Warrant [Member] Note Warrant2 [Member] Note Warrant2 [Member] Note Warrant2 [Member] Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Accelerated Share Repurchases [Line Items] Accelerated Share Repurchases [Line Items] Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Stock Repurchased During Period, Value Stock Repurchased During Period, Value Dividends, Common Stock, Cash Dividends, Common Stock, Cash Class of Warrant or Right, Outstanding Class of Warrant or Right, Outstanding Derivative, Price Risk Option Strike Price Derivative, Price Risk Option Strike Price Warrant Option Strike Price Warrant Option Strike Price Warrant Option Strike Price Shares, Issued Shares, Issued SELECTED QUARTERLY RESULTS (Unaudited) [Abstract] SELECTED QUARTERLY RESULTS (Unaudited) [Abstract] Schedule of Effect of Fourth Quarter Events [Table] Effect of Fourth Quarter Events [Table] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Pegatron [Member] Pegatron [Member] Pegatron [Member] Technology Solutions Customer [Member] Technology Solutions Customer [Member] Technology Solutions Customer [Member] Intel Corporation [Member] Intel Corporation [Member] Intel Corporation [Member] Past Infringement [Member] Past Infringement [Member] Past Infringement [Member] Effect of Fourth Quarter Event Type [Axis] Effect of Fourth Quarter Event Type [Axis] Effect of Fourth Quarter Events, Type [Domain] Effect of Fourth Quarter Events, Type [Domain] Effect of Fourth Quarter Events [Line Items] Effect of Fourth Quarter Events [Line Items] Royalty Revenue Royalty Revenue Schedule of RSU Award Vesting Schedule of RSU Award Vesting [Table Text Block] Schedule of RSU Award Vesting [Table Text Block] Schedule of Equity Instruments Available for Grant [Table Text Block] Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] 4. LITIGATION AND LEGAL PROCEEDINGS [Abstract] 4. LITIGATION AND LEGAL PROCEEDINGS [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] China, Yuan Renminbi China, Yuan Renminbi United States of America, Dollars United States of America, Dollars ZTE [Domain] ZTE [Domain] ZTE [Domain] Huawei China [Member] Huawei China [Member] Huawei China [Member] Asustek [Domain] Asustek [Domain] Asustek [Domain] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] ReliefSought1 [Member] ReliefSought1 [Member] ReliefSought1 [Member] ReliefSought2 [Member] ReliefSought2 [Member] ReliefSought2 [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case Type [Domain] Litigation Case [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Loss Contingency, Damages Sought, Value Loss Contingency, Damages Sought, Value Legal Matters and Contingencies [Text Block] Legal Matters and Contingencies [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Share-based Compensation [Abstract] Forfeiture Rate [Line Items] Forfeiture Rate [Line Items] Forfeiture Rate [Line Items] Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRateptions Represents the rate at which stock options are expected to be forfeited by employees subsequent to their vest dates. Common Domain Members [Abstract] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Subsegments [Axis] Subsegments [Axis] Subsegments [Domain] Subsegments [Domain] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Report Date [Axis] Report Date [Axis] Financial Statement Filing Date [Domain] Financial Statement Filing Date [Domain] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Income Tax Contingency [Table] Income Tax Contingency [Table] Components of Income Tax Expense [Axis] Components of Income Tax Expense [Axis] Components of Income Tax Expense [Axis] Components of Income Tax Expense [Domain] Components of Income Tax Expense [Domain] Components of Income Tax Expense [Domain] 2017 Income Tax Reform [Domain] 2017 Income Tax Reform [Domain] 2017 Income Tax Reform [Domain] ForeignGovenmentswithUSTaxTreaties [Domain] ForeignGovenmentswithUSTaxTreaties [Domain] ForeignGovenmentswithUSTaxTreaties [Domain] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Foreign Tax Authority [Member] Foreign Tax Authority [Member] Research and Development Arrangement [Member] Research and Development Arrangement [Member] Federal Domestic Tax Authority [Member] Tax Period [Axis] Tax Period [Axis] Tax Period [Domain] Tax Period [Domain] Tax Period 2006-2013 [Member] [Domain] Tax Period 2006-2013 [Member] [Domain] Tax Period 2006-2013 [Member] [Domain] [Domain] Tax Period 2006-2016 [Domain] Tax Period 2006-2016 [Domain] Tax Period 2006-2016 [Domain] Earliest Tax Year [Member] Earliest Tax Year [Member] Latest Tax Year [Member] Latest Tax Year [Member] Tax Year 2013 [Member] Tax Year 2013 [Member] Tax Year 2016 [Member] Tax Year 2016 [Member] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Income Tax Expense (Benefit) Unrecognized Tax Benefits Foreign Income Tax Expense (Benefit), Continuing Operations Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Unrecognized Tax Benefits Tax Credit Carryforward, Amount Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease) Revenue Agreements [Abstract] Revenue Agreements [Abstract] Revenue Recognition, Multiple-deliverable Arrangements [Table] Revenue Recognition, Multiple-deliverable Arrangements [Table] Revenue Classification [Axis] Revenue Classification [Axis] Revenue Classification [Axis] Past Patent Royalties [Domain] Past Patent Royalties [Domain] Past Patent Royalties [Domain] Past Patent Royalties [Member] Past Patent Royalties [Member] Past Patent Royalties [Member] Customer [Axis] Customer [Domain] LG [Member] LG [Member] LG [Member] Patent License Agreement 2017 - A [Domain] Patent License Agreement 2017 - A [Domain] Patent License Agreement 2017 - A [Domain] Apple [Member] Apple [Member] Apple [Member] Arima Communications Corporation [Member] Arima Communications Corporation [Member] Arima Communications Corporation [Member] Samsung Electronics, Ltd. [Member] Samsung Electronics, Ltd. [Member] Samsung Electronics [Member] Sony Corporation of America [Member] Sony Corporation of America [Member] Sony Corporation of America [Member] Kyocera [Member] Kyocera [Member] Kyocera [Member] Patent License Agreement 2017 - B [Domain] Patent License Agreement 2017 - B [Domain] Patent License Agreement 2017 - B [Domain] Fujitsu and another customer [Domain] Fujitsu and another customer [Domain] Fujitsu and another customer [Domain] Recurring Revenue [Domain] Recurring Revenue [Domain] Recurring Revenue [Domain] Type of Arrangement and Non-arrangement Transactions [Axis] Type of Arrangement and Non-arrangement Transactions [Axis] Arrangements and Non-arrangement Transactions [Domain] Arrangements and Non-arrangement Transactions [Domain] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Finite-Lived Patents, Gross Finite-Lived Patents, Gross Interest Income (Expense), Net Interest Income (Expense), Net Allowance for Loan and Lease Loss, Recovery of Bad Debts Allowance for Loan and Lease Loss, Recovery of Bad Debts Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment [Table Text Block] Schedule of Quarterly Financial Information [Table Text Block] Quarterly Financial Information [Table Text Block] Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] Reclassifications [Text Block] Reclassifications [Text Block] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Consolidation, Policy [Policy Text Block] Consolidation, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Internal Use Software, Policy [Policy Text Block] Internal Use Software, Policy [Policy Text Block] Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Equity and Cost Method Investments, Policy [Policy Text Block] Equity and Cost Method Investments, Policy [Policy Text Block] Intangible Assets, Finite-Lived, Policy [Policy Text Block] Intangible Assets, Finite-Lived, Policy [Policy Text Block] Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy [Policy Text Block] Goodwill and Intangible Assets, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Deferred Charges, Policy [Policy Text Block] Deferred Charges, Policy [Policy Text Block] Research and Development Expense, Policy [Policy Text Block] Research and Development Expense, Policy [Policy Text Block] Compensation Related Costs, Policy [Policy Text Block] Compensation Related Costs, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] New Accounting Pronouncement or Change in Accounting Principle, Description New Accounting Pronouncements, Policy [Policy Text Block] Consolidated Statements of Shareholders’ Equity and Comprehensive Income for the years ended December 31, 2010, 2009 and 2008 [Abstract] Consolidated Statements of Shareholders’ Equity and Comprehensive Income for the years ended December 31, 2010, 2009 and 2008 [Abstract] Statement, Equity Components [Axis] Common Stock [Member] Retained Earnings [Member] AOCI Attributable to Parent [Member] Treasury Stock [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Net change in unrealized gain on short-term investments Unrealized Gain (Loss) on Investments Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Noncontrolling Interest in Variable Interest Entity Noncontrolling Interest in Variable Interest Entity Beginning balance Stockholders' Equity Attributable to Parent Beginning balance in Shares Beginning balance Treasury Stock, Shares Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Distribution preference Distribution preference Distribution preference Other-than-temporary impairment losses related to available for sale securities, net of income taxes of $0, $65, $0 Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities Total Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Dividends Dividends Exercise of Common Stock options, shares Exercise of Common Stock options Stock Issued During Period, Value, Stock Options Exercised Issuance of Restricted Common Stock, net value Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Tax benefit from exercise of stock options Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Amortization of unearned compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Payments of Financing Costs Payments of Financing Costs Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Convertible note hedge transactions, net of tax Convertible note hedge transactions net of tax Allocated portion of discount from the Notes to equity Issuance of Warrants during period Adjustments to Additional Paid in Capital, Warrant Issued Deferred financing costs allocated to equity Adjustments to Additional Paid in Capital, Other Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Ending balance Ending balance in Shares Ending balance Treasury Stock, Shares Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Fair Value Measurements [Abstract] Fair Value Measurements [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Money Market Funds and Demand Deposits [Member] Accounts that may or may not bear interest and that depositor is entitled to withdraw at anytime without prior notice. Checking and negotiable order of withdrawal (NOW) accounts are the most common forms of demand deposits. Additionally, includes a fund that has underlying investments in short-term money-market instruments, such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid and safe securities and pays money market rates of interest. Commercial Paper [Member] US Treasury and Government [Member] Corporate Bonds and Asset Backed Securities [Domain] Corporate Bonds-This category includes information about long-term debt securities that are issued by either a domestic or foreign corporate business entity with a date certain promise of repayment and a return to the holder for the time value of money (for example, variable or fixed interest, original issue discount). Asset Backed Securities-This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets (such as mortgage loans or credit-card receivables). Corporate Bond Securities [Member] Corporate Bond Securities [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash and Cash Equivalents, at Carrying Value Senior Notes Senior Notes Concentration Risk, Additional Characteristic Concentration Risk, Additional Characteristic Concentration Risk, Percentage Concentration Risk, Percentage Assets, Fair Value Disclosure, Recurring Assets, Fair Value Disclosure, Recurring Commercial Paper Commercial Paper Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities Long-term Debt, Fair Value Long-term Debt, Fair Value Cost-method Investments, Other than Temporary Impairment Cost-method Investments, Other than Temporary Impairment Cost Method Investments Cost Method Investments Investment Owned, at Fair Value Intangible Assets, Gross (Excluding Goodwill) OBLIGATIONS: [Abstract] OBLIGATIONS: [Abstract] Long-term Debt [Text Block] Long-term Debt [Text Block] Equity [Abstract] Dividends Payable [Table] Dividends Payable [Table] Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Dividends Payable [Line Items] Dividends Payable [Line Items] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] New Accounting Policies - ASC 606 [Abstract] New Accounting Policies - ASC 606 [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Fixed-Fee Agreements [Domain] Fixed-Fee Agreements [Domain] Fixed-Fee Agreements [Domain] Dynamic Fixed-Fee Agreements [Domain] Dynamic Fixed-Fee Agreements [Domain] Dynamic Fixed-Fee Agreements [Domain] Other [Domain] Other [Domain] Other [Domain] Accounting Guidance [Axis] Accounting Guidance [Axis] Accounting Guidance [Axis] Accounting Guidance [Domain] Accounting Guidance [Domain] [Domain] for Accounting Guidance [Axis] ASC 605 [Domain] ASC 605 [Domain] ASC 605 [Domain] ASC 606 [Domain] ASC 606 [Domain] ASC 606 [Domain] Accounts Receivable [Member] Accounts Receivable [Member] Deferred Tax Asset [Domain] Deferred Tax Asset [Domain] Taxes Payable [Domain] Taxes Payable [Domain] Taxes Payable [Domain] Deferred Revenue [Domain] Deferred Revenue [Domain] Retained Earnings [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Static Fixed Fee Agreements [Domain] Static Fixed Fee Agreements [Domain] Static Fixed Fee Agreements [Domain] Static Prepayments [Domain] Static Prepayments [Domain] Static Prepayments [Domain] Quarter Lag Reporting [Domain] Quarter Lag Reporting [Domain] Quarter Lag Reporting [Domain] Significant Financing Component [Domain] Significant Financing Component [Domain] Significant Financing Component [Domain] Related Tax Effect and Other Balance Sheet Impact [Domain] Related Tax Effect and Other Balance Sheet Impact [Domain] Related Tax Effect and Other Balance Sheet Impact [Domain] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Deferred Revenue, Revenue Recognized Deferred Revenue To Be Recognized Next 12 Months Deferred Revenue To Be Recognized Next 12 Months Deferred Revenue To Be Recognized Year 2 Deferred Revenue To Be Recognized Year 2 Deferred Revenue To Be Recognized Year 2 Deferred Revenue To Be Recognized Year 3 Deferred Revenue To Be Recognized Year 3 Deferred Revenue To Be Recognized Year 3 Deferred Revenue To Be Recognized Year 4 Deferred Revenue To Be Recognized Year 4 Deferred Revenue To Be Recognized Year 4 Deferred Revenue To Be Recognized Year 5 Deferred Revenue To Be Recognized Year 5 Deferred Revenue To Be Recognized Year 5 Accounts Receivable, Net Accounts Receivable, Net Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Taxes Payable Taxes Payable Deferred Revenue Deferred Revenue Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Deferred Revenue To Be Recognized Thereafter Deferred Revenue To Be Recognized Thereafter Deferred Revenue To Be Recognized Thereafter Deferred Revenue To Be Recognized Total Deferred Revenue To Be Recognized Total Deferred Revenue To Be Recognized Total Research and Development [Abstract] Litigation Awards [Abstract] Litigation Awards [Abstract] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] 2011-2015 [Member] 2011-2015 [Member] 2011-2015 [Member] State State and Local Jurisdiction [Member] New York State Division of Taxation and Finance [Member] New York State Division of Taxation and Finance [Member] Foreign Additions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Excess Tax Benefit from Share-based Compensation, Operating Activities Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign source withholding tax Current Foreign Tax Expense (Benefit) Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Foreign source withholding tax Deferred Foreign Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit) Income Tax Expense (Benefit) Effective Income Tax Rate Reconciliation, Percent Net operating losses Deferred Tax Assets, Operating Loss Carryforwards, Domestic Deferred Tax Assets, Operating Loss Carryforwards, Domestic Deferred Tax Assets, Operating Loss Carryforwards, State and Local Deferred Tax Assets, Operating Loss Carryforwards, State and Local Deferred Tax Assets, Operating Loss Carryforwards, State and Local Operating Loss Carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Foreign Deferred Tax Assets, Operating Loss Carryforwards, Foreign Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Operating Loss Carryforwards Deferred revenue, net Deferred Tax Assets, Deferred Income Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Patent amortization Deferred Tax Asset Amortization of Intangibles Deferred Tax Asset Amortization of Intangibles Deferred Tax Asset Depreciation Deferred Tax Asset Depreciation Deferred Tax Asset Depreciation Deferred Tax Asset OTTI Deferred Tax Asset OTTI Deferred Tax Asset OTTI Other accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Other employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits Deferred Tax Assets Net Before Deducting Valuation Allowance Deferred Tax Assets Net Before Deducting Valuation Allowance Deferred Tax Assets Net Before Deducting Valuation Allowance Less: valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred tax asset Deferred Tax Assets, Net of Valuation Allowance Tax at U.S. statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Change in federal and state valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Adjustment to tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Adjustments to uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Permanent differences Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Tax Adjustments, Settlements, and Unusual Provisions Tax Adjustments, Settlements, and Unusual Provisions Settlement with taxing authorities Effective Income Tax Rate Reconciliation, Tax Settlement, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Unrecognized Tax Benefits Unrecognized Tax Benefits Deferred Tax Assets, Tax Credit Carryforwards, Research Deferred Tax Assets, Tax Credit Carryforwards, Research Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Foreign Income Tax Expense (Benefit), Continuing Operations Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Reductions Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Settlements Lapses in statues of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Schedule of Debt [Table Text Block] Schedule of Debt [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Statement of Comprehensive Income [Abstract] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net Income (Loss) Attributable to Parent Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Total comprehensive income attributable to InterDigital, Inc. Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Cash, Cash Equivalents, and Short-term Investments [Abstract] Available-for-sale Securities, Gross Realized Gains Available-for-sale Securities, Gross Realized Gains Available-for-sale Securities, Gross Realized Losses Available-for-sale Securities, Gross Realized Losses Available-for-sale Securities, Gross Realized Gain (Loss) Available-for-sale Securities, Gross Realized Gain (Loss) Restructuring and Related Activities [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Restructuring Plan [Axis] Restructuring Plan [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Class of Warrant or Right [Table] Class of Warrant or Right [Table] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Corporate Bonds and Asset Backed Securities [Domain] Commercial Paper [Member] Money Market Funds and Demand Deposits [Member] US Government Corporations and Agencies Securities [Member] US Government Corporations and Agencies Securities [Member] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 1 [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Available-for-sale Securities Available-for-sale Securities Short-term Investments Short-term Investments Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Available-for-sale Securities, Gross Unrealized Gain Available-for-sale Securities, Gross Unrealized Gain Available-for-sale Securities, Gross Unrealized Loss Available-for-sale Securities, Gross Unrealized Loss TAXES [Abstract] TAXES [Abstract] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] Goodwill [Abstract] Goodwill [Abstract] Goodwill Goodwill Other Income and Other Expense Disclosure [Text Block] Other Income and Other Expense Disclosure [Text Block] Related Party Transactions Disclosure [Text Block] Related Party Transactions Disclosure [Text Block] Schedule of Cash and Cash Equivalents [Table Text Block] Schedule of Cash and Cash Equivalents [Table Text Block] Realized Gain (Loss) on Investments [Table Text Block] Realized Gain (Loss) on Investments [Table Text Block] Available-for-sale Securities [Table Text Block] Available-for-sale Securities [Table Text Block] Fair Value, Measurement Inputs, Disclosure [Table Text Block] Fair Value, Measurement Inputs, Disclosure [Text Block] Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] GEOGRAPHIC CUSTOMER CONCENTRATION [Abstract] GEOGRAPHIC/CUSTOMER CONCENTRATION [Abstract] Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Patents [Abstract] Patents [Abstract] Patents [Table] Patents [Table] Patents [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Developed Technology Rights [Member] Developed Technology Rights [Member] Patents Purchased [Member] Patents Purchased [Member] Patents Purchased [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense Amortization of Intangible Assets Short-term Investments [Abstract] Available-for-sale Securities, Debt Maturities, within One Year, Fair Value Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Significant Events [Abstract] Significant Events [Abstract] Investments in Other Entities [Abstract] Investments in Other Entities [Abstract] Schedule of Cost and Equity method Investments [Table] Schedule of Cost-method Investments [Table] Investment, Name [Axis] Investment, Name [Domain] Schedule of Cost and Equity method Investments [Line Items] Schedule of Cost-method Investments [Line Items] Payments for (Proceeds from) Long-term Investments Long-term Investments Long-term Investments Quarterly Financial Information [Text Block] Quarterly Financial Information [Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Customer Relationships [Member] Customer Relationships [Member] Patented Technology [Member] Patented Technology [Member] Trade Names [Member] Trade Names [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Net Income (Loss) Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Payments to Acquire Businesses, Net of Cash Acquired Cash Acquired from Acquisition Cash Acquired from Acquisition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Goodwill, Gross Goodwill, Gross Legal Matters and Contingencies [Text Block] Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Subsequent Events [Text Block] Subsequent Events [Text Block] COMMITMENTS [Abstract] COMMITMENTS [Abstract] Commitments Disclosure [Text Block] Commitments Disclosure [Text Block] Deferred Charges [Abstract] Deferred Charges [Abstract] Deferred Charges [Table] Deferred Charges [Table] Other Long-term Liabilities [Member] other long term liabilities [Member] Scenario, Unspecified [Domain] Deferred Sales Commission Current [Member] Capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. Deferred Contract Revenue Costs Current [Member] Deferred Costs incurred and are directly related to generating contract revenues. Deferred Sales Commission Non-Current [Member] Capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. Deferred Contract Revenue Costs Non-Current [Member] Deferred Costs incurred and are directly related to generating contract revenues. Deferred Charges [Line Items] Deferred Charges [Line Items] Payments for Commissions Payments for Commissions Contract Revenue Cost Contract Revenue Cost Payments of Debt Issuance Costs Other Deferred Costs, Net Other Deferred Costs, Net Deferred Finance Costs, Net Debt Issuance Costs, Net Sales Commissions and Fees Sales Commissions and Fees Amortization of Financing Costs Amortization of Debt Issuance Costs Deferred Finance Costs, Gross Debt Issuance Costs, Gross Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Repurchases related to 2020 Notes [Member] Repurchases related to 2020 Notes [Member] Repurchases related to 2020 Notes [Member] Balance Sheet by Location [Domain] Balance Sheet by Location [Domain] Balance Sheet by Location [Domain] other long-term assets [Member] other long-term assets [Member] other long-term assets [Member] Convertible Notes 2020 [Member] Convertible Notes 2020 [Member] Convertible Notes 2020 [Member] [Domain] Convertible Debt 1 [Member] Convertible Debt 1 [Member] Convertible Note Overallotment [Member] Convertible Note 2 [Member] Convertible Notes 2016 [Member] Convertible Notes 2016 [Member] Convertible Note Hedge 1 [Member] convertible note hedge 1 [Member] Convertible Note Hedge 2 [Member] convertible note hedge 2 [Member] Convertible Note Hedge [Member] Convertible Hedge [Member] Convertible Note/ Hedge Warrant, net [Member] Convertible Note Hedge Warrant, net [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Accelerated Share Repurchases, Initial Price Paid Per Share Accelerated Share Repurchases, Initial Price Paid Per Share Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Convertible, Conversion Ratio Debt Instrument, Convertible, Conversion Ratio Debt Conversion, Converted Instrument, Amount Debt Conversion, Converted Instrument, Amount Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Price Payments for (Proceeds from) Hedge, Financing Activities Payments for (Proceeds from) Hedge, Financing Activities Senior Convertible Notes [Equity net of tax] Senior Convertible Notes [Equity net of tax] Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Convertible notes can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. Debt Instrument, Face Amount Debt Instrument, Face Amount Debt Instrument, Interest Rate, Effective Percentage Debt Instrument, Interest Rate, Effective Percentage Interest Expense, Debt, Excluding Amortization Interest Expense, Debt, Excluding Amortization Accretion of debt discount Accretion Expense Senior Convertible Note, Note Hedge, and Warrant Transaction Interest Expense Senior Convertible Note, Note Hedge, and Warrant Transaction Interest Expense The component of interest expense comprised of the following: 1) Coupon Interest - interest expense charge for contractual coupon interest due on face value of the Senior Convertible Note 2) Accretion of Debt Discount - amortization of Original Issue Discount (which is charged to interest expense) on the Senior Convertible Note over the life of the Note, and 3) Amortization of Deferred Financing Costs - periodic charge against earnings over the life of the financing arrangement to which such costs relate. Balance as of January 1 Liability for Uncertainty in Income Taxes, Noncurrent Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Impairment of Long-Lived Assets [Abstract] Impairment of Long-Lived Assets [Abstract] Schedule of Impaired Long-Lived Assets Held and Used [Table] Schedule of Impaired Long-Lived Assets Held and Used [Table] Impaired Assets to be Disposed of by Method Other than Sale by Type [Axis] Impaired Assets to be Disposed of by Method Other than Sale by Type [Axis] Impaired Assets to be Disposed of by Method Other than Sale, Asset Name [Domain] Impaired Assets to be Disposed of by Method Other than Sale, Asset Name [Domain] Impaired Long-Lived Assets Held and Used [Line Items] Impaired Long-Lived Assets Held and Used [Line Items] Impairment of Long-Lived Assets to be Disposed of Impairment of Long-Lived Assets to be Disposed of Internal-Use Software Costs [Abstract] Internal-Use Software Costs [Abstract] Software Development [Member] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Parties to Contractual Arrangement [Axis] Lease Arrangement, Type [Axis] Parties to Contractual Arrangement [Domain] Lease Arrangement, Type [Domain] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating Leases, Income Statement [Abstract] Operating Leases, Rent Expense Operating Leases, Rent Expense 2012 - Operating leases Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Four Years 2016 - Operating leases Operating Leases, Future Minimum Payments, Due in Five Years Thereafter - Operating leases Operating Leases, Future Minimum Payments, Due Thereafter Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Text Block] Significant Accounting Policies [Text Block] VIE [Abstract] VIE [Abstract] Liabilities, Total [Member] Liabilities, Total [Member] VIE Asset Class [Axis] VIE Asset Class [Axis] VIE Asset Class [Axis] Assets [Member] Assets [Member] Cash and Cash Equivalents [Member] Cash and Cash Equivalents [Member] Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Variable Interest Entity, Consolidated, Carrying Amount, Assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment Disclosure [Text Block] Intangible Assets [Abstract] Intangible Assets [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Trade Names, Gross Finite-Lived Trade Names, Gross Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Customer Relationships, Gross Finite-Lived Customer Relationships, Gross Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-Lived Intangible Assets, Amortization Expense, after Year Five Earnings Per Share [Abstract] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Warrant [Member] Warrant [Member] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — BASIC Weighted Average Number Diluted Shares Outstanding Adjustment Weighted Average Number Diluted Shares Outstanding Adjustment WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — DILUTED Dilutive Securities, Effect on Basic Earnings Per Share Dilutive Securities, Effect on Basic Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Condensed Consolidated Balance Sheets [Abstract] Condensed Consolidated Balance Sheets [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Short-term Investments Deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Current Prepaid and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current NON-CURRENT ASSETS: Assets, Noncurrent [Abstract] PROPERTY AND EQUIPMENT, NET PATENTS, NET OTHER NON-CURRENT ASSETS, NET Other Assets, Noncurrent Total non-current assets Assets, Noncurrent TOTAL ASSETS Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] CURRENT LIABILITIES: Liabilities, Current [Abstract] Long-term Debt, Current Maturities Long-term Debt, Current Maturities Accounts payable Accounts Payable Accrued compensation and related expenses Employee-related Liabilities, Current Deferred revenue Deferred Revenue, Current Other accrued expenses Other Accrued Liabilities Total current liabilities Liabilities, Current LONG-TERM DEBT NON-CURRENT LIABILITIES Liabilities, Noncurrent [Abstract] LONG-TERM DEFERRED REVENUE Deferred Revenue, Noncurrent OTHER LONG-TERM LIABILITIES Other Liabilities, Noncurrent TOTAL LIABILITIES Liabilities COMMITMENTS AND CONTINGENCIES Commitments and Contingencies SHAREHOLDERS’ EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Preferred Stock, $0.10 par value, 0 and 14,399 shares authorized 0 shares issued and outstanding Preferred Stock, Value, Outstanding Common Stock, $0.01 par value, 100,000 shares authorized, 68,968 and 68,602 shares issued and 45,398 and 45,032 shares outstanding Common Stock, Value, Outstanding Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings, Unappropriated Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Stockholders' Equity before Treasury Stock Stockholders' Equity before Treasury Stock Treasury stock, 23,570 shares of common held at cost Treasury Stock, Value Total shareholders’ equity Total equity TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity Business Description and Basis of Presentation [Text Block] Business Description and Basis of Presentation [Text Block] Foreign Currency Translation [Abstract] Foreign Currency Transactions and Translations Policy [Policy Text Block] Foreign Currency Transactions and Translations Policy [Policy Text Block] Convertible Notes 2016 [Member] Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Deferred Finance Costs, Gross Long-term Debt Convertible Debt Long-term Debt, Current Maturities Land and Building Carrying Amount Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2013 - Long Term Debt Maturities Long-term Debt, Maturities, Repayments of Principal in Year Two 2014 - Long Term Debt Maturities Long-term Debt, Maturities, Repayments of Principal in Year Three 2015 - Long Term Debt Maturities Long-term Debt, Maturities, Repayments of Principal in Year Four 2016 - Long Term Debt Maturities Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter - Long Term Debt Maturities Long-term Debt, Maturities, Repayments of Principal after Year Five Total debt obligations Long-term Debt, Gross Interest expense Interest Expense Interest and investment income Investment Income, Interest and Dividend