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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common stock
Additional Paid-In Capital
Accumulated Deficit
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)   172    
Issuance of stock on options exercised and restricted stock units vested 2 $ 2    
Share-based compensation 2,153   2,153  
Tax benefit from share-based compensation (428)   (428)  
Net income (loss) (32,620)     (32,620)
Balances (in shares) at Mar. 31, 2020   28,051    
Balances at Mar. 31, 2020 258,851 $ 281 463,368 (204,798)
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]        
Net income (loss) (111,186)      
Balances (in shares) at Jun. 30, 2020   28,124    
Balances at Jun. 30, 2020 182,040 $ 281 465,123 (283,364)
Balances (in shares) at Mar. 31, 2020   28,051    
Balances at Mar. 31, 2020 258,851 $ 281 463,368 (204,798)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of stock on options exercised and restricted stock units vested (in shares)   73    
Issuance of stock on options exercised and restricted stock units vested 0 $ 0    
Share-based compensation 1,755   1,755  
Net income (loss) (78,566)     (78,566)
Balances (in shares) at Jun. 30, 2020   28,124    
Balances at Jun. 30, 2020 182,040 $ 281 465,123 (283,364)
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)   303    
Issuance of stock on options exercised and restricted stock units vested 101 $ 3 98  
Share-based compensation 2,669   2,669  
Tax benefit from share-based compensation (3,439)   (3,439)  
Net income (loss) 10,620     10,620
Balances (in shares) at Mar. 31, 2021   28,462    
Balances at Mar. 31, 2021 171,213 $ 285 470,047 (299,119)
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]        
Net income (loss) 113,626      
Balances (in shares) at Jun. 30, 2021   28,870    
Balances at Jun. 30, 2021 276,687 $ 289 472,511 (196,113)
Balances (in shares) at Mar. 31, 2021   28,462    
Balances at Mar. 31, 2021 171,213 $ 285 470,047 (299,119)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of stock on options exercised and restricted stock units vested (in shares)   408    
Issuance of stock on options exercised and restricted stock units vested 4 $ 4    
Share-based compensation 2,586   2,586  
Tax benefit from share-based compensation (122)   (122)  
Net income (loss) 103,006     103,006
Balances (in shares) at Jun. 30, 2021   28,870    
Balances at Jun. 30, 2021 $ 276,687 $ 289 $ 472,511 $ (196,113)