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Net Income Per Share - Numerator and Denominator of Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]            
Net income applicable to InterDigital, Inc. $ 21,069 $ 17,994 $ 1,618 $ 5,571 $ 39,063 $ 7,189
Weighted-average shares outstanding:            
Weighted-average shares outstanding: basic (in shares) 30,413   30,804   30,557 30,820
Dilutive effect of stock options, RSUs, convertible securities and warrants (in shares) 297   385   435 372
Weighted-average shares outstanding: diluted (in shares) 30,710   31,189   30,992 31,192
Earnings per share:            
Net income per common share: basic (in USD per share) $ 0.69   $ 0.05   $ 1.28 $ 0.23
Dilutive effect of stock options, RSUs, convertible securities and warrants (in USD per share) 0   0   (0.02) 0
Net income per common share: diluted (in USD per share) $ 0.69   $ 0.05   $ 1.26 $ 0.23