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CONSOLIDATED STATEMENTS OF CHANGES IN 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
Accumulated Other Comprehensive Income (Loss)
Retained Earnings (Accumulated Deficit)
Retained Earnings (Accumulated Deficit)
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2020     85,895            
Beginning balance at Dec. 31, 2020 $ 619,600   $ 859 $ 1,229,320   $ (278) $ (589,178)   $ (21,123)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 3,706     3,706          
Exercise of stock options (in shares)     594            
Exercise of stock options 6,518   $ 6 6,512          
Restricted stock units vested, net of shares withheld for taxes (in shares)     290            
Restricted stock units vested, net of shares withheld for taxes (2,688)   $ 3 (2,691)          
Foreign currency translation adjustment (31)         (31)      
Net loss (9,807)           (9,807)    
Ending balance (in shares) at Mar. 31, 2021     86,779            
Ending balance at Mar. 31, 2021 617,298   $ 868 1,236,847   (309) (598,985)   (21,123)
Beginning balance (in shares) at Dec. 31, 2020     85,895            
Beginning balance at Dec. 31, 2020 619,600   $ 859 1,229,320   (278) (589,178)   (21,123)
Ending balance (in shares) at Dec. 31, 2021     90,759            
Ending balance at Dec. 31, 2021 $ 693,633 $ (66,383) $ 908 1,340,989 $ (106,172) (362) (626,779) $ 39,789 (21,123)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2020-06                
Stock-based compensation expense $ 5,346     5,346          
Exercise of stock options (in shares)     37            
Exercise of stock options 309     309          
Restricted stock units vested, net of shares withheld for taxes (in shares)     334            
Restricted stock units vested, net of shares withheld for taxes (4,983)   $ 3 (4,986)          
Leveraged stock units vested, net of shares withheld for taxes (in shares)     458            
Leveraged stock units vested, net of shares withheld for taxes (11,231)   $ 5 (11,236)          
Foreign currency translation adjustment (132)         (132)      
Net loss (5,350)           (5,350)    
Ending balance (in shares) at Mar. 31, 2022     91,588            
Ending balance at Mar. 31, 2022 $ 611,209   $ 916 $ 1,224,250   $ (494) $ (592,340)   $ (21,123)