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Consolidated Statements of Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Deficit [Member]
Balance at Dec. 31, 2020 $ 747,717 $ 856 $ 1,029,453 $ 3,530 $ (286,122)
Balance, Shares at Dec. 31, 2020   85,593,000      
Net income (loss) 17,642       17,642
Net loss attributable to noncontrolling interest [1] (8)       (8)
Unrealized holding loss (gain) on investments, net of tax (1,133)     (1,133)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,042   1,042    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   52,000      
Issuance of restricted stock   $ 7 (7)    
Issuance of restricted stock, shares   660,000      
Forfeitures of restricted stock, shares   (13,000)      
Stock-based compensation expense 3,717   3,717    
Repurchased common stock (1,994) $ 1 1,993    
Repurchased common stock, shares   82,000      
Balance at Mar. 31, 2021 766,983 $ 862 1,032,212 2,397 (268,488)
Balance, Shares at Mar. 31, 2021   86,210,000      
Balance at Dec. 31, 2020 747,717 $ 856 1,029,453 3,530 (286,122)
Balance, Shares at Dec. 31, 2020   85,593,000      
Net income (loss) 83,448        
Net loss attributable to noncontrolling interest (21)        
Balance at Sep. 30, 2021 845,677 $ 864 1,045,285 2,223 (202,695)
Balance, Shares at Sep. 30, 2021   86,402,000      
Balance at Mar. 31, 2021 766,983 $ 862 1,032,212 2,397 (268,488)
Balance, Shares at Mar. 31, 2021   86,210,000      
Net income (loss) 35,011       35,011
Net loss attributable to noncontrolling interest [1] (6)       (6)
Unrealized holding loss (gain) on investments, net of tax 116     116  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,536 $ 1 1,535    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   71,000      
Issuance of restricted stock   $ 1 (1)    
Issuance of restricted stock, shares   69,000      
Forfeitures of restricted stock   $ (1) 1    
Forfeitures of restricted stock, shares   (5,000)      
Stock-based compensation expense 5,735   5,735    
Repurchased common stock (251)   251    
Repurchased common stock, shares   8,000      
Balance at Jun. 30, 2021 809,124 $ 863 1,039,231 2,513 (233,483)
Balance, Shares at Jun. 30, 2021   86,337,000      
Net income (loss) 30,795       30,795
Net loss attributable to noncontrolling interest [1] (7)       (7)
Unrealized holding loss (gain) on investments, net of tax (290)     (290)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 3,034 $ 2 3,032    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   148,000      
Stock-based compensation expense 5,495   5,495    
Repurchased common stock (2,474) $ 1 2,473    
Repurchased common stock, shares   83,000      
Balance at Sep. 30, 2021 845,677 $ 864 1,045,285 2,223 (202,695)
Balance, Shares at Sep. 30, 2021   86,402,000      
Balance at Dec. 31, 2021 896,692 $ 864 1,049,696 1,317 (155,185)
Balance, Shares at Dec. 31, 2021   86,423,000      
Net income (loss) (21,188)       (21,188)
Dissolution of and net loss attributable to noncontrolling interest [1] (203)   10   (213)
Unrealized holding loss (gain) on investments, net of tax (2,668)     (2,668)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,174   1,174    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   50,000      
Issuance of restricted stock   $ 8 (8)    
Issuance of restricted stock, shares   766,000      
Forfeitures of restricted stock, shares   (5,000)      
Stock-based compensation expense 4,435   4,435    
Repurchased common stock (1,166)   1,166    
Repurchased common stock, shares   50,000      
Balance at Mar. 31, 2022 877,076 $ 872 1,054,141 (1,351) (176,586)
Balance, Shares at Mar. 31, 2022   87,184,000      
Balance at Dec. 31, 2021 896,692 $ 864 1,049,696 1,317 (155,185)
Balance, Shares at Dec. 31, 2021   86,423,000      
Net income (loss) 36,676        
Net loss attributable to noncontrolling interest $ (4)        
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares 0        
Repurchased common stock, shares 0        
Balance at Sep. 30, 2022 $ 858,667 $ 830 980,659 (4,100) (118,722)
Balance, Shares at Sep. 30, 2022   83,006,000      
Balance at Mar. 31, 2022 877,076 $ 872 1,054,141 (1,351) (176,586)
Balance, Shares at Mar. 31, 2022   87,184,000      
Net income (loss) 27,136       27,136
Unrealized holding loss (gain) on investments, net of tax (1,234)     (1,234)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,664 $ 1 1,663    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   82,000      
Issuance of restricted stock   $ 1 (1)    
Issuance of restricted stock, shares   74,000      
Forfeitures of restricted stock, shares   (5,000)      
Stock-based compensation expense 5,186   5,186    
Repurchased common stock (64,398) $ (33) (64,365)    
Repurchased common stock, shares   (3,275,000)      
Balance at Jun. 30, 2022 845,430 $ 841 996,624 (2,585) (149,450)
Balance, Shares at Jun. 30, 2022   84,060,000      
Net income (loss) 30,728       30,728
Net loss attributable to noncontrolling interest (0)        
Unrealized holding loss (gain) on investments, net of tax (1,515)     (1,515)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,381 $ 1 1,380    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   74,000      
Issuance of restricted stock, shares   1,000      
Forfeitures of restricted stock   $ (1) 1    
Forfeitures of restricted stock, shares   (8,000)      
Stock-based compensation expense 4,120   4,120    
Repurchased common stock (21,477) $ 11 21,466
Repurchased common stock, shares   1,121,000      
Balance at Sep. 30, 2022 $ 858,667 $ 830 $ 980,659 $ (4,100) $ (118,722)
Balance, Shares at Sep. 30, 2022   83,006,000      
[1] Net loss component is presented within retained deficit on the consolidated balance sheet as the balance is immaterial.