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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Accumulated Other Comprehensive Loss
Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2020     71,389              
Beginning balance (in shares) at Dec. 31, 2020               40,573    
Beginning balance at Dec. 31, 2020 $ 796,566 $ (39,762) $ 714 $ 738,481 $ (55,349) $ 1,413,969 $ 15,587 $ (1,379,611) $ (184) $ 23,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. 5,571         5,571        
Net loss attributable to noncontrolling interest (1,613)                 (1,613)
Noncontrolling interest distribution (1,109)                 (1,109)
Net change in unrealized loss on short-term investments (70)               (70)  
Dividends declared ($0.35 per share) (10,766)     210   (10,976)        
Exercise of common stock options (in shares)     32              
Exercise of common stock options 737     737            
Issuance of common stock, net (in shares)     55              
Issuance of common stock, net (2,962)     (2,962)            
Amortization of unearned compensation 2,153     2,153            
Repurchase of common stock (in shares)               91    
Repurchase of common stock (5,750)             $ (5,750)    
Ending balance (in shares) at Mar. 31, 2021     71,476              
Ending balance (in shares) at Mar. 31, 2021               40,664    
Ending balance at Mar. 31, 2021 742,995   $ 714 683,270   1,424,151   $ (1,385,361) (254) 20,475
Beginning balance (in shares) at Dec. 31, 2020     71,389              
Beginning balance (in shares) at Dec. 31, 2020               40,573    
Beginning balance at Dec. 31, 2020 796,566 $ (39,762) $ 714 738,481 $ (55,349) 1,413,969 $ 15,587 $ (1,379,611) (184) 23,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. 7,189                  
Net loss attributable to noncontrolling interest (10,028)                  
Net change in unrealized loss on short-term investments (139)                  
Ending balance (in shares) at Jun. 30, 2021     71,588              
Ending balance (in shares) at Jun. 30, 2021               40,746    
Ending balance at Jun. 30, 2021 726,667   $ 715 690,123   1,414,844   $ (1,390,752) (323) 12,060
Beginning balance (in shares) at Mar. 31, 2021     71,476              
Beginning balance (in shares) at Mar. 31, 2021               40,664    
Beginning balance at Mar. 31, 2021 742,995   $ 714 683,270   1,424,151   $ (1,385,361) (254) 20,475
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. 1,618         1,618        
Net loss attributable to noncontrolling interest (8,415)                 (8,415)
Net change in unrealized loss on short-term investments (69)               (69)  
Dividends declared ($0.35 per share) (10,767)     158   (10,925)        
Exercise of common stock options (in shares)     71              
Exercise of common stock options 3,632   $ 1 3,631            
Issuance of common stock, net (in shares)     41              
Issuance of common stock, net (711)     (711)            
Amortization of unearned compensation 3,775     3,775            
Repurchase of common stock (in shares)               82    
Repurchase of common stock (5,391)             $ (5,391)    
Ending balance (in shares) at Jun. 30, 2021     71,588              
Ending balance (in shares) at Jun. 30, 2021               40,746    
Ending balance at Jun. 30, 2021 $ 726,667   $ 715 690,123   1,414,844   $ (1,390,752) (323) 12,060
Beginning balance (in shares) at Dec. 31, 2021 30,689   71,720              
Beginning balance (in shares) at Dec. 31, 2021 41,031             41,031    
Beginning balance at Dec. 31, 2021 $ 752,917   $ 717 713,599   1,441,105   $ (1,409,611) (571) 7,678
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. 17,994         17,994        
Net loss attributable to noncontrolling interest (290)                 (290)
Noncontrolling interest distribution (1,928)                 (1,928)
Noncontrolling interest contribution 1,500                 1,500
Net change in unrealized loss on short-term investments (310)               (310)  
Dividends declared ($0.35 per share) (10,803)     158   (10,961)        
Exercise of common stock options (in shares)     24              
Exercise of common stock options 1,226     1,226            
Issuance of common stock, net (in shares)     139              
Issuance of common stock, net (5,026)   $ 1 (5,027)            
Amortization of unearned compensation 5,386     5,386            
Ending balance (in shares) at Mar. 31, 2022     71,883              
Ending balance (in shares) at Mar. 31, 2022               41,031    
Ending balance at Mar. 31, 2022 $ 760,666   $ 718 715,342   1,448,138   $ (1,409,611) (881) 6,960
Beginning balance (in shares) at Dec. 31, 2021 30,689   71,720              
Beginning balance (in shares) at Dec. 31, 2021 41,031             41,031    
Beginning balance at Dec. 31, 2021 $ 752,917   $ 717 713,599   1,441,105   $ (1,409,611) (571) 7,678
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. 39,063                  
Net loss attributable to noncontrolling interest (775)                  
Net change in unrealized loss on short-term investments $ (367)                  
Ending balance (in shares) at Jun. 30, 2022 29,657   71,912              
Ending balance (in shares) at Jun. 30, 2022 42,255             42,255    
Ending balance at Jun. 30, 2022 $ 685,244   $ 719 704,370   1,458,674   $ (1,484,056) (938) 6,475
Beginning balance (in shares) at Mar. 31, 2022     71,883              
Beginning balance (in shares) at Mar. 31, 2022               41,031    
Beginning balance at Mar. 31, 2022 760,666   $ 718 715,342   1,448,138   $ (1,409,611) (881) 6,960
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. 21,069         21,069        
Net loss attributable to noncontrolling interest (485)                 (485)
Net change in unrealized loss on short-term investments (57)               (57)  
Dividends declared ($0.35 per share) (10,380)     153   (10,533)        
Exercise of common stock options (in shares)     0              
Exercise of common stock options 0     0            
Issuance of common stock, net (in shares)     29              
Issuance of common stock, net (707)   $ 1 (708)            
Amortization of unearned compensation 3,977     3,977            
Repurchase of common stock (in shares)               1,224    
Repurchase of common stock (74,445)             $ (74,445)    
Net convertible note hedge transactions, net of tax (54,257)     (54,257)            
Net warrant transactions $ 39,863     39,863            
Ending balance (in shares) at Jun. 30, 2022 29,657   71,912              
Ending balance (in shares) at Jun. 30, 2022 42,255             42,255    
Ending balance at Jun. 30, 2022 $ 685,244   $ 719 $ 704,370   $ 1,458,674   $ (1,484,056) $ (938) $ 6,475