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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative effect, change in accounting
Common stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Deficit
Cumulative effect, change in accounting
Balances (in shares) at Dec. 31, 2018     26,779      
Balances at Dec. 31, 2018 $ 315,152 $ (12,272) $ 268 $ 435,245 $ (120,361) $ (12,272)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of stock on options exercised and restricted stock units vested (in shares)     189      
Issuance of stock on options exercised and restricted stock units vested 57   $ 2 55    
Share-based compensation 10,045     10,045    
Tax benefit from share-based compensation (301)     (301)    
Issuance of common stock, net of offering costs (in shares)     911      
Issuance of common stock, net of offering costs 16,608   $ 9 16,599    
Net income (loss) (39,545)       (39,545)  
Balances (in shares) at Dec. 31, 2019     27,879      
Balances at Dec. 31, 2019 289,744   $ 279 461,643 (172,178)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of stock on options exercised and restricted stock units vested (in shares)     330      
Issuance of stock on options exercised and restricted stock units vested 3   $ 3      
Repurchases of common stock (in shares)     (50)      
Repurchases of common stock (950)       (950)  
Share-based compensation 9,525     9,525    
Tax benefit from share-based compensation (449)     (449)    
Net income (loss) (136,611)       (136,611)  
Balances (in shares) at Dec. 31, 2020     28,159      
Balances at Dec. 31, 2020 161,262   $ 282 470,719 (309,739)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of stock on options exercised and restricted stock units vested (in shares)     898      
Issuance of stock on options exercised and restricted stock units vested 107   $ 9 98    
Repurchases of common stock (in shares)     (227)      
Repurchases of common stock (10,616)   $ (3)   (10,613)  
Share-based compensation 13,844     13,844    
Tax benefit from share-based compensation (6,832)     (6,832)    
Net income (loss) 161,776       161,776  
Balances (in shares) at Dec. 31, 2021     28,830      
Balances at Dec. 31, 2021 $ 319,541   $ 288 $ 477,829 $ (158,576)