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STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Beginning Balance at Dec. 31, 2018 $ 6,032 $ 1 $ 144,965 $ (138,934)
Beginning Balance, shares at Dec. 31, 2018   773,558    
Issuance of common stock for cash, net of offering costs 6,909 $ 1 6,908  
Issuance of common stock for cash, net of offering costs, shares   820,561    
Adjustment for fractional shares   (49)    
Share-based compensation 151   151  
Net loss (5,482)     (5,482)
Ending Balance at Dec. 31, 2019 $ 7,610 $ 2 152,024 (144,416)
Ending Balance, shares at Dec. 31, 2019 1,594,070 1,594,070    
Issuance of common stock and exercise of prefunded warrants for cash, net of offering costs $ 48,606 $ 8 48,598  
Issuance of common stock and exercise of prefunded warrants for cash, net of offering costs, shares   7,954,080    
Share-based compensation 43   43  
Net loss (9,738)     (9,738)
Ending Balance at Dec. 31, 2020 $ 46,521 $ 10 $ 200,665 $ (154,154)
Ending Balance, shares at Dec. 31, 2020 9,548,150 9,548,150