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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Stock Repurchase Program
Tender Offer
Employees and Directors
Non-employee
Common Stock
Common Stock
Stock Repurchase Program
Common Stock
Tender Offer
Additional Paid-in Capital
Additional Paid-in Capital
Employees and Directors
Additional Paid-in Capital
Non-employee
Treasury Stock
Treasury Stock
Stock Repurchase Program
Treasury Stock
Tender Offer
Accumulated Other Comprehensive Income (Loss)
Retained Earnings (Accumulated Deficit)
Beginning balance (in shares) at Dec. 31, 2018           115,031                    
Beginning balance at Dec. 31, 2018 $ 275,882         $ 117     $ 417,228     $ (23,657)     $ (70) $ (117,736)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Issuance of common stock upon exercise of options (in shares) 2,900         2,929                    
Issuance of common stock upon exercise of options $ 10,402         $ 3     10,399              
Shares tendered to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises (in shares)           (631)                    
Shares tendered to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises (8,072)                     (8,072)        
Stock-based compensation related to employee and director options       $ 29,201 $ 232         $ 29,201 $ 232          
Other comprehensive loss, net of tax 331                           331  
Purchases of treasury stock (in shares)           (2,780)                    
Purchase of treasury stock (30,975)                     (30,975)        
Net income 94,181                             94,181
Ending balance at Dec. 31, 2019 $ 371,182         $ 120     457,060     (62,704)     261 (23,555)
Ending balance (in shares) at Dec. 31, 2019           114,549                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Issuance of common stock upon exercise of options (in shares) 2,800         2,819                    
Issuance of common stock upon exercise of options $ 25,305         $ 2     25,303              
Shares tendered to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises (in shares)           (154)                    
Shares tendered to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises (3,146)                     (3,146)        
Stock-based compensation related to employee and director options       33,777           33,777            
Other comprehensive loss, net of tax 154                           154  
Purchases of treasury stock (in shares)           (479)                    
Purchase of treasury stock (9,945)                     (9,945)        
Net income 106,011                             106,011
Ending balance at Dec. 31, 2020 $ 523,338         $ 122     516,140     (75,795)     415 82,456
Ending balance (in shares) at Dec. 31, 2020           116,735                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Issuance of common stock upon exercise of options (in shares) 4,632         4,632                    
Issuance of common stock upon exercise of options $ 32,046         $ 5     32,041              
Shares tendered to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises (in shares)           (1,560)                    
Shares tendered to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises (38,631)                     (38,631)        
Stock-based compensation related to employee and director options       $ 43,168           $ 43,168            
Other comprehensive loss, net of tax (642)                           (642)  
Purchases of treasury stock (in shares)             (3,867) (10,000)                
Purchase of treasury stock   $ (88,485) $ (207,500)                   $ (88,485) $ (207,500)    
Net income 112,512                             112,512
Ending balance at Dec. 31, 2021 $ 375,806         $ 127     $ 591,349     $ (410,411)     $ (227) $ 194,968
Ending balance (in shares) at Dec. 31, 2021           105,940