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CONSOLIDATED STATEMENTS 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)   1,189,000    
Issuance of common stock and common stock warrants, net of issuance costs 5,963   5,963  
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 291   291  
Net loss (8,568)     (8,568)
Ending balance (in shares) at Jun. 30, 2020   6,717,900    
Ending balance at Jun. 30, 2020 3,783 $ 1 113,497 (109,715)
Beginning balance (in shares) at Mar. 31, 2020   6,717,900    
Beginning balance at Mar. 31, 2020 8,062 $ 1 113,351 (105,290)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 146   146  
Net loss (4,425)     (4,425)
Ending balance (in shares) at Jun. 30, 2020   6,717,900    
Ending balance at Jun. 30, 2020 3,783 $ 1 113,497 (109,715)
Beginning balance (in shares) at Dec. 31, 2020   14,254,554    
Beginning 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 upon exercise of warrants (in shares)   832,460    
Issuance of common stock upon exercise of warrants 3,017 $ 1 3,016  
Stock-based compensation 448   448  
Net loss (7,016)     (7,016)
Ending balance (in shares) at Jun. 30, 2021   15,873,941    
Ending balance at Jun. 30, 2021 33,415 $ 2 158,333 (124,920)
Beginning balance (in shares) at Mar. 31, 2021   15,084,754    
Beginning balance at Mar. 31, 2021 28,742 $ 2 149,047 (120,307)
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 upon exercise of warrants (in shares)   2,260    
Issuance of common stock upon exercise of warrants 17   17  
Stock-based compensation 264   264  
Net loss (4,613)     (4,613)
Ending balance (in shares) at Jun. 30, 2021   15,873,941    
Ending balance at Jun. 30, 2021 $ 33,415 $ 2 $ 158,333 $ (124,920)