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Consolidated Statements of Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Deficit [Member]
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 gain (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   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        
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 gain (loss) 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
Unrealized holding gain (loss) 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      
Balance at Dec. 31, 2022 891,632 $ 829 983,601 (3,735) (89,063)
Balance, Shares at Dec. 31, 2022   82,947,000      
Net Income (Loss) 14,206       14,206
Unrealized holding gain (loss) on investments, net of tax 604     604  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,095   1,095    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   86,000      
Issuance of restricted stock   $ 9 (9)    
Issuance of restricted stock, shares   871,000      
Forfeitures of restricted stock   $ (2) 2    
Forfeitures of restricted stock, shares   (221,000)      
Stock-based compensation expense 3,009   3,009    
Repurchased common stock (775)   (775)    
Repurchased common stock, shares   (49,000)      
Balance at Mar. 31, 2023 909,771 $ 836 986,923 (3,131) (74,857)
Balance, Shares at Mar. 31, 2023   83,634,000      
Balance at Dec. 31, 2022 891,632 $ 829 983,601 (3,735) (89,063)
Balance, Shares at Dec. 31, 2022   82,947,000      
Net Income (Loss) $ 63,879        
Repurchased common stock, shares 0        
Balance at Sep. 30, 2023 $ 967,985 $ 839 995,847 (3,517) (25,184)
Balance, Shares at Sep. 30, 2023   83,929,000      
Balance at Mar. 31, 2023 909,771 $ 836 986,923 (3,131) (74,857)
Balance, Shares at Mar. 31, 2023   83,634,000      
Net Income (Loss) 28,282       28,282
Unrealized holding gain (loss) on investments, net of tax (387)     (387)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,594 $ 1 1,593    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   126,000      
Issuance of restricted stock   $ 1 (1)    
Issuance of restricted stock, shares   93,000      
Forfeitures of restricted stock, shares   (11,000)      
Stock-based compensation expense 3,126   3,126    
Repurchased common stock (11)   (11)    
Repurchased common stock, shares   (1,000)      
Balance at Jun. 30, 2023 942,375 $ 838 991,630 (3,518) (46,575)
Balance, Shares at Jun. 30, 2023   83,841,000      
Net Income (Loss) 21,391       21,391
Unrealized holding gain (loss) on investments, net of tax 1     1  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,187 $ 1 1,186    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   100,000      
Forfeitures of restricted stock, shares   (1,000)      
Stock-based compensation expense 3,164   3,164    
Repurchased common stock (133)   (133)    
Repurchased common stock, shares   (11,000)      
Balance at Sep. 30, 2023 $ 967,985 $ 839 $ 995,847 $ (3,517) $ (25,184)
Balance, Shares at Sep. 30, 2023   83,929,000      
[1] Net loss component is presented within retained deficit on the consolidated balance sheet as the balance is immaterial.