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CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Shares in Treasury [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017 $ 57,476 $ 3 $ 112,021   $ (54,548)  
Beginning balance, shares at Dec. 31, 2017   27,718,780        
Net loss (27,897)       (27,897)  
Stock-based compensation 7,007   7,007      
Stock-based compensation, shares   888,149        
Issuance of common stock 57,041   57,041      
Issuance of common stock, shares   4,057,500        
Shares withheld for net share settlement (230)     $ (230)    
Shares withheld for net share settlement, shares   (15,536)        
Ending balance at Dec. 31, 2018 93,397 $ 3 176,069 (230) (82,445)  
Ending balance, shares at Dec. 31, 2018   32,648,893        
Net loss (39,612)       (39,612)  
Stock-based compensation 9,175   9,175      
Stock-based compensation, shares   369,260        
Issuance of common stock 344   344      
Shares withheld for net share settlement (813)     (813)    
Shares withheld for net share settlement, shares   (66,824)        
Other comprehensive income (loss) 17         $ 17
Ending balance at Dec. 31, 2019 62,508 $ 3 185,588 (1,043) (122,057) 17
Ending balance, shares at Dec. 31, 2019   32,951,329        
Net loss (44,836)       (44,836)  
Stock-based compensation 4,971   4,971      
Stock-based compensation, shares   381,507        
Issuance of common stock 14,249 $ 1 14,248      
Issuance of common stock, shares   3,750,000        
Shares withheld for net share settlement, shares   (17,792)        
Other comprehensive income (loss) (17)         $ (17)
Ending balance at Dec. 31, 2020 $ 36,875 $ 4 $ 204,807 $ (1,043) $ (166,893)  
Ending balance, shares at Dec. 31, 2020   37,065,044