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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, 2017     26,413      
Balances at Dec. 31, 2017 $ 319,913   $ 264 $ 399,510 $ (79,861)  
Issuance of stock on options exercised and restricted stock units vested (in shares)     610      
Issuance of stock on options exercised and restricted stock units vested $ 1,322   $ 6 1,316    
Repurchases of common stock (in shares) (1,200)   (1,219)      
Repurchases of common stock $ (19,598)   $ (12)   (19,586)  
Share-based compensation 9,641     9,641    
Tax benefit from share-based compensation (820)     (820)    
Issuance of common stock, net of offering costs (in shares)     975      
Issuance of common stock, net of offering costs 25,608   $ 10 25,598    
Net income (loss) (20,914)       (20,914)  
Balances (in shares) at Dec. 31, 2018     26,779      
Balances at Dec. 31, 2018 $ 315,152   $ 268 435,245 (120,361)  
Accounting standards update [extensible list] us-gaap:AccountingStandardsUpdate201602Member          
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)    
Share issuance related to business combination (in shares)     911      
Share issuance related to business combination 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 $ (12,272) $ 279 461,643 (172,178) $ (12,272)
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)