| Cover | 12 Months Ended |
| Dec. 31, 2022 | |
| Document Information [Line Items] | |
| Document Type | DEF 14A |
| Amendment Flag | false |
| Entity Information [Line Items] | |
| Entity Registrant Name | INTERDIGITAL, INC. |
| Entity Central Index Key | 0001405495 |
| Pay vs Performance Disclosure - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended | ||
| Apr. 05, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | |
| Pay vs Performance Disclosure [Table] | |||||
| Pay vs Performance [Table Text Block] | Pay Versus Performance In following statement ow execu compensation Year-end value of $100 Year Summary (1) Summary (2) Compensation (1)(3)(4)(5) Compensation (2)(3)(4)(5) Average Non-CEO (6) Average Non-CEO (3)(4)(5)(6) IDCC NASDAQ $ Net Income Adjusted (7) Revenue 2022 4,824,787 0 8,473,818 0 2,660,110 3,432,926 97.42 95.61 93.7 254.5 457.8 2021 10,824,838 1,570,440 19,400,708 -711,223 1,426,410 2,407,304 137.70 127.87 55.3 208.0 425.4 2020 0 2,642,504 0 3,740,057 1,218,153 1,067,958 114.28 122.04 44.8 155.3 359.0 (1) Liren Chen became CEO of the Company on April 5, 2021. (2) William Merritt served as CEO until his retirement on April 5, 2021. (3) Deductions from, and additions to, total compensation in the Summary Compensation Table by year to calculate Compensation Actually Paid include: 2022 2021 2020 Liren Average NEOs Liren Chen William Average Non-CEO NEOs William Average NEOs Total Compensation from Summary Compensation Table $ 4,824,787 $ 2,660,110 $ 10,824,838 $ 1,570,440 $ 1,426,410 $ 2,642,504 $ 1,218,153 Adjustments for Pension Adjustment Summary Compensation Table Pension — — — — — — — Amount added for current year service cost — — — — — — — Amount added for prior service cost impacting current year — — — — — — — Total Adjustments for Pension $ — $ — $ — $ — $ — $ — $ — Adjustments for Equity Awards Adjustment for grant date values in the Summary Compensation Table $ (2,200,025 ) $ (1,575,024 ) $ (5,219,984 ) $ — $ (637,515 ) $ (1,083,348 ) $ (397,237 ) Year-end $ 5,249,160 $ 1,866,893 $ 7,850,314 $ — $ 907,588 $ 2,102,469 $ 558,750 Year-over-year difference of year-end $ 783,791 $ 532,141 $ — $ (1,601,770 ) $ 623,362 $ 611,174 $ (569,990 ) Fair values at vest date for awards granted and vested in current year $ — $ — $ 5,945,540 $ — $ — $ 681,993 $ 475,054 Difference in fair values between prior year-end $ (183,895 ) $ (51,194 ) $ — $ (679,893 ) $ 87,459 $ (1,214,735 ) $ (216,773 ) Forfeitures during current year equal to prior year-end $ — $ — $ — $ — $ — $ — $ — Dividends or dividend equivalents not otherwise included in total compensation $ — $ — $ — $ — $ — $ — $ — Total Adjustments for Equity Awards $ 3,649,031 $ 772,816 $ 8,575,870 $ (2,281,663 ) $ 980,895 $ 1,097,553 $ (150,195 ) Compensation Actually Paid (as calculated) $ 8,473,818 $ 3,432,926 $ 19,400,708 $ (711,223 ) $ 2,407,304 $ 3,740,057 $ 1,067,958 (4) The following summarizes the valuation assumptions used for stock option awards included as part of Compensation Actually Paid: • Expected life of each stock option is based on the “simplified method” using an average of the remaining vest and remaining term, as of the vest/FYE date. • Strike price is based on each grant date closing price and asset price is based on each vest/FYE closing price. • Risk free rate is based on the Treasury Constant Maturity rate closest to the remaining expected life as of the vest/FYE date. • Historical volatility is based on daily price history for each expected life (years) prior to each vest/FYE date. Closing prices provided by S&P Capital IQ are adjusted for dividends and splits. • Represents annual dividend yield on each vest/FYE date. (5) Assumptions used in the valuation of equity awards for purposes of calculating Compensation Actually Paid were materially the same as at grant date, except for adjusting for expected performance of PRSUs at each measurement date. (6) Non 2022: Richard Brezski; Eric Cohen; Eeva Hakoranta; Rajesh Pankaj 2021: Richard Brezski; Eric Cohen; Eeva Hakoranta; Henry Tirri 2020: Richard Brezski; Richard Gulino; Kai Öistämö (7) Adjusted EBITDA is a non-GAAP | ||||
| Company Selected Measure Name | Adjusted EBITDA | ||||
| Named Executive Officers, Footnote [Text Block] | (6) Non 2022: Richard Brezski; Eric Cohen; Eeva Hakoranta; Rajesh Pankaj 2021: Richard Brezski; Eric Cohen; Eeva Hakoranta; Henry Tirri 2020: Richard Brezski; Richard Gulino; Kai Öistämö | ||||
| Adjustment To PEO Compensation, Footnote [Text Block] | 2022 2021 2020 Liren Average NEOs Liren Chen William Average Non-CEO NEOs William Average NEOs Total Compensation from Summary Compensation Table $ 4,824,787 $ 2,660,110 $ 10,824,838 $ 1,570,440 $ 1,426,410 $ 2,642,504 $ 1,218,153 Adjustments for Pension Adjustment Summary Compensation Table Pension — — — — — — — Amount added for current year service cost — — — — — — — Amount added for prior service cost impacting current year — — — — — — — Total Adjustments for Pension $ — $ — $ — $ — $ — $ — $ — Adjustments for Equity Awards Adjustment for grant date values in the Summary Compensation Table $ (2,200,025 ) $ (1,575,024 ) $ (5,219,984 ) $ — $ (637,515 ) $ (1,083,348 ) $ (397,237 ) Year-end $ 5,249,160 $ 1,866,893 $ 7,850,314 $ — $ 907,588 $ 2,102,469 $ 558,750 Year-over-year difference of year-end $ 783,791 $ 532,141 $ — $ (1,601,770 ) $ 623,362 $ 611,174 $ (569,990 ) Fair values at vest date for awards granted and vested in current year $ — $ — $ 5,945,540 $ — $ — $ 681,993 $ 475,054 Difference in fair values between prior year-end $ (183,895 ) $ (51,194 ) $ — $ (679,893 ) $ 87,459 $ (1,214,735 ) $ (216,773 ) Forfeitures during current year equal to prior year-end $ — $ — $ — $ — $ — $ — $ — Dividends or dividend equivalents not otherwise included in total compensation $ — $ — $ — $ — $ — $ — $ — Total Adjustments for Equity Awards $ 3,649,031 $ 772,816 $ 8,575,870 $ (2,281,663 ) $ 980,895 $ 1,097,553 $ (150,195 ) Compensation Actually Paid (as calculated) $ 8,473,818 $ 3,432,926 $ 19,400,708 $ (711,223 ) $ 2,407,304 $ 3,740,057 $ 1,067,958 | ||||
| Non-PEO NEO Average Total Compensation Amount | $ 2,660,110 | $ 1,426,410 | $ 1,218,153 | ||
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 3,432,926 | 2,407,304 | 1,067,958 | ||
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | 2022 2021 2020 Liren Average NEOs Liren Chen William Average Non-CEO NEOs William Average NEOs Total Compensation from Summary Compensation Table $ 4,824,787 $ 2,660,110 $ 10,824,838 $ 1,570,440 $ 1,426,410 $ 2,642,504 $ 1,218,153 Adjustments for Pension Adjustment Summary Compensation Table Pension — — — — — — — Amount added for current year service cost — — — — — — — Amount added for prior service cost impacting current year — — — — — — — Total Adjustments for Pension $ — $ — $ — $ — $ — $ — $ — Adjustments for Equity Awards Adjustment for grant date values in the Summary Compensation Table $ (2,200,025 ) $ (1,575,024 ) $ (5,219,984 ) $ — $ (637,515 ) $ (1,083,348 ) $ (397,237 ) Year-end $ 5,249,160 $ 1,866,893 $ 7,850,314 $ — $ 907,588 $ 2,102,469 $ 558,750 Year-over-year difference of year-end $ 783,791 $ 532,141 $ — $ (1,601,770 ) $ 623,362 $ 611,174 $ (569,990 ) Fair values at vest date for awards granted and vested in current year $ — $ — $ 5,945,540 $ — $ — $ 681,993 $ 475,054 Difference in fair values between prior year-end $ (183,895 ) $ (51,194 ) $ — $ (679,893 ) $ 87,459 $ (1,214,735 ) $ (216,773 ) Forfeitures during current year equal to prior year-end $ — $ — $ — $ — $ — $ — $ — Dividends or dividend equivalents not otherwise included in total compensation $ — $ — $ — $ — $ — $ — $ — Total Adjustments for Equity Awards $ 3,649,031 $ 772,816 $ 8,575,870 $ (2,281,663 ) $ 980,895 $ 1,097,553 $ (150,195 ) Compensation Actually Paid (as calculated) $ 8,473,818 $ 3,432,926 $ 19,400,708 $ (711,223 ) $ 2,407,304 $ 3,740,057 $ 1,067,958 | ||||
| Compensation Actually Paid vs. Total Shareholder Return [Text Block] | |||||
| Compensation Actually Paid vs. Net Income [Text Block] | |||||
| Compensation Actually Paid vs. Company Selected Measure [Text Block] | |||||
| Total Shareholder Return Vs Peer Group [Text Block] | |||||
| Tabular List [Table Text Block] | Most Important Performance Measures In our assessment, the most important performance measures used to link CAP (as calculated in accordance with the SEC rules) to Company performance are listed below. The role of each of these performance measures in our executive compensation program is discussed in the CD&A. • Adjusted EBIDTA • Revenue | ||||
| Total Shareholder Return Amount | $ 97.42 | 137.7 | 114.28 | ||
| Peer Group Total Shareholder Return Amount | 95.61 | 127.87 | 122.04 | ||
| Net Income (Loss) | $ 93,700,000 | $ 55,300,000 | $ 44,800,000 | ||
| Company Selected Measure Amount | 254,500,000 | 208,000,000 | 155,300,000 | ||
| Measure [Axis]: 1 | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Measure Name | Adjusted EBIDTA | ||||
| Non-GAAP Measure Description [Text Block] | Adjusted EBITDA is a non-GAAP | ||||
| Measure [Axis]: 2 | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Compensation Actually Paid vs. Other Measure [Text Block] | |||||
| Other Performance Measure Amount | 457,800,000 | 425,400,000 | 359,000,000 | ||
| Measure Name | Revenue | ||||
| Liren Chen [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| PEO Total Compensation Amount | $ 4,824,787 | $ 10,824,838 | $ 0 | ||
| PEO Actually Paid Compensation Amount | $ 8,473,818 | 19,400,708 | 0 | ||
| PEO Name | Liren Chen | Liren Chen | |||
| William Merritt [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| PEO Total Compensation Amount | $ 0 | 1,570,440 | 2,642,504 | ||
| PEO Actually Paid Compensation Amount | 0 | (711,223) | $ 3,740,057 | ||
| PEO Name | William Merritt | William Merritt | |||
| PEO [Member] | Liren Chen [Member] | Adjustment Summary Compensation Table Pension [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | Liren Chen [Member] | Amount Added For Current Year Service Cost [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | Liren Chen [Member] | Amount Added For Prior Service Cost Impacting Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | Liren Chen [Member] | Total Adjustments for Pension [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | Liren Chen [Member] | Adjustment For Grant Date Values In The Summary Compensation [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (2,200,025) | (5,219,984) | |||
| PEO [Member] | Liren Chen [Member] | YearEnd Fair Value Of Unvested Awards Granted In The Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 5,249,160 | 7,850,314 | |||
| PEO [Member] | Liren Chen [Member] | YearOverYear Difference Of YearEnd Fair Values For Unvested Awards Granted In Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 783,791 | 0 | |||
| PEO [Member] | Liren Chen [Member] | Fair Values At Vest Date For Awards Granted And Vested In Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 5,945,540 | |||
| PEO [Member] | Liren Chen [Member] | Difference In Fair Values Between Prior YearEnd Fair Values And Vest Date Fair Values For Awards Granted In Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (183,895) | 0 | |||
| PEO [Member] | Liren Chen [Member] | Forfeitures During Current Year Equal To Prior YearEnd Fair Value [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | Liren Chen [Member] | Dividends Or Dividend Equivalents Not Otherwise Included In Total Compensation [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | Liren Chen [Member] | Total Adjustments For Equity Awards [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 3,649,031 | 8,575,870 | |||
| PEO [Member] | William Merritt [Member] | Adjustment Summary Compensation Table Pension [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | $ 0 | |||
| PEO [Member] | William Merritt [Member] | Amount Added For Current Year Service Cost [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | William Merritt [Member] | Amount Added For Prior Service Cost Impacting Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | William Merritt [Member] | Total Adjustments for Pension [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | William Merritt [Member] | Adjustment For Grant Date Values In The Summary Compensation [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | (1,083,348) | |||
| PEO [Member] | William Merritt [Member] | YearEnd Fair Value Of Unvested Awards Granted In The Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 2,102,469 | |||
| PEO [Member] | William Merritt [Member] | YearOverYear Difference Of YearEnd Fair Values For Unvested Awards Granted In Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (1,601,770) | 611,174 | |||
| PEO [Member] | William Merritt [Member] | Fair Values At Vest Date For Awards Granted And Vested In Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 681,993 | |||
| PEO [Member] | William Merritt [Member] | Difference In Fair Values Between Prior YearEnd Fair Values And Vest Date Fair Values For Awards Granted In Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (679,893) | (1,214,735) | |||
| PEO [Member] | William Merritt [Member] | Forfeitures During Current Year Equal To Prior YearEnd Fair Value [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | William Merritt [Member] | Dividends Or Dividend Equivalents Not Otherwise Included In Total Compensation [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | |||
| PEO [Member] | William Merritt [Member] | Total Adjustments For Equity Awards [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (2,281,663) | 1,097,553 | |||
| Non-PEO NEO [Member] | Adjustment Summary Compensation Table Pension [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | 0 | ||
| Non-PEO NEO [Member] | Amount Added For Current Year Service Cost [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | 0 | ||
| Non-PEO NEO [Member] | Amount Added For Prior Service Cost Impacting Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | 0 | ||
| Non-PEO NEO [Member] | Total Adjustments for Pension [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | 0 | ||
| Non-PEO NEO [Member] | Adjustment For Grant Date Values In The Summary Compensation [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (1,575,024) | (637,515) | (397,237) | ||
| Non-PEO NEO [Member] | YearEnd Fair Value Of Unvested Awards Granted In The Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 1,866,893 | 907,588 | 558,750 | ||
| Non-PEO NEO [Member] | YearOverYear Difference Of YearEnd Fair Values For Unvested Awards Granted In Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 532,141 | 623,362 | (569,990) | ||
| Non-PEO NEO [Member] | Fair Values At Vest Date For Awards Granted And Vested In Current Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | 475,054 | ||
| Non-PEO NEO [Member] | Difference In Fair Values Between Prior YearEnd Fair Values And Vest Date Fair Values For Awards Granted In Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (51,194) | 87,459 | (216,773) | ||
| Non-PEO NEO [Member] | Forfeitures During Current Year Equal To Prior YearEnd Fair Value [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | 0 | ||
| Non-PEO NEO [Member] | Dividends Or Dividend Equivalents Not Otherwise Included In Total Compensation [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 0 | 0 | 0 | ||
| Non-PEO NEO [Member] | Total Adjustments For Equity Awards [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | $ 772,816 | $ 980,895 | $ (150,195) | ||
