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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, 2019   5,080,100    
Beginning 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 (in shares)   2,472,576    
Issuance of common stock for exercise of warrants 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock and common stock warrants, net of issuance costs (in shares)   786,927    
Issuance of common stock and common stock warrants, net of issuance costs 9,005   9,005  
Issuance of common stock for exercise of warrants (in shares)   844,061    
Issuance of common stock for exercise of warrants 3,069 $ 1 3,068  
Vesting of restricted stock units (in shares)   10,095    
Stock-based compensation 1,011   1,011  
Net loss (20,699)     (20,699)
Ending balance (in shares) at Dec. 31, 2021   15,895,637    
Ending balance at Dec. 31, 2021 $ 20,347 $ 2 $ 158,948 $ (138,603)