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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018   440,529    
Beginning balance at Dec. 31, 2018 $ 5,245 $ 1 $ 87,099 $ (81,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock and common stock warrants, net of issuance costs (in shares)   1,051,441    
Issuance of common stock and common stock warrants, net of issuance costs 16,144   16,144  
Issuance of common stock for exercise of warrants, net of offering costs (in shares)   2,102,744    
Issuance of common stock for exercise of warrants, net of offering costs 3,658   3,658  
Issuance of common stock upon exercise of pre-funded warrants (in shares)   1,485,156    
Issuance of common stock upon exercise of pre-funded warrants 8   8  
Impact of anti-dilution protection on liability-classified warrants (243)   (243)  
Issuance of common stock upon vesting of restricted stock units (in shares)   230    
Stock-based compensation 573   573  
Net loss (19,292)     (19,292)
Ending balance (in shares) at Dec. 31, 2019   5,080,100    
Ending balance at Dec. 31, 2019 6,093 $ 1 107,239 (101,147)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock and common stock warrants, net of issuance costs (in shares)   6,253,078    
Issuance of common stock and common stock warrants, net of issuance costs 29,418   29,418  
Issuance of common stock for exercise of warrants, net of offering costs (in shares)   2,472,576    
Issuance of common stock for exercise of warrants, net of offering costs 8,625   8,625  
Issuance of common stock upon exercise of pre-funded warrants (in shares)   448,800    
Issuance of common stock upon exercise of pre-funded warrants 4   4  
Stock-based compensation 578   578  
Net loss (16,757)     (16,757)
Ending balance (in shares) at Dec. 31, 2020   14,254,554    
Ending balance at Dec. 31, 2020 $ 27,961 $ 1 $ 145,864 $ (117,904)