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CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Common Stock [Member]
ATM Facility Member
Common Stock [Member]
Follow-on Public Offering [Member]
Additional Paid-In Capital [Member]
Additional Paid-In Capital [Member]
ATM Facility Member
Additional Paid-In Capital [Member]
Follow-on Public Offering [Member]
Shares in Treasury [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2018 $ 93,397 $ 3     $ 176,069     $ (230) $ (82,445)  
Beginning balance, shares at Dec. 31, 2018   32,648,893                
Net loss (39,612)               (39,612)  
Stock-based compensation 9,175       9,175          
Issuance of common stock from stock-based compensation awards,shares   369,260                
Issuance of common stock from stock-based compensation awards 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          
Issuance of common stock from stock-based compensation awards,shares   381,507                
Issuance of common stock from stock-based compensation awards 212       212          
Issuance of common stock 14,037     $ 1     $ 14,036      
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                
Net loss (29,199)               (29,199)  
Stock-based compensation 2,090       2,090          
Issuance of common stock from stock-based compensation awards,shares   270,303                
Issuance of common stock from stock-based compensation awards 227       227          
Issuance of common stock 4,139         $ 4,139        
Issuance of common stock, shares     1,438,647              
Ending balance at Dec. 31, 2021 $ 14,132 $ 4     $ 211,263     $ (1,043) $ (196,092)  
Ending balance, shares at Dec. 31, 2021   38,773,994