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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 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, 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)
Net loss attributable to noncontrolling interest (4)        
Dissolution of and net loss attributable to noncontrolling interest [1] (203)   10   (213)
Unrealized holding loss 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 0 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 0 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      
[1] Net loss component is presented within retained deficit on the consolidated balance sheet as the balance is immaterial.