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Unaudited Condensed Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019   12,560,990    
Beginning balance at Dec. 31, 2019 $ 55,659 $ 13 $ 220,248 $ (164,602)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in shares)   43,700    
Exercise of stock options 10   10  
Stock-based compensation 431   431  
Net exercise of common stock warrants (in shares)   22,366    
Net exercise of common stock warrants 0      
Net loss (5,563)     (5,563)
Ending balance (in shares) at Mar. 31, 2020   12,627,056    
Ending balance at Mar. 31, 2020 $ 50,537 $ 13 220,689 (170,165)
Beginning balance (in shares) at Dec. 31, 2020 12,652,308 12,652,308    
Beginning balance at Dec. 31, 2020 $ 41,839 $ 13 223,115 (181,289)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of stock in public offering, net of issuance costs of $4,435 (in shares)   4,255,000    
Issuance of stock in public offering, net of issuance costs of $4,435 64,709 $ 4 64,705  
Exercise of stock options (in shares)   3,381    
Exercise of stock options 44   44  
Issuance of stock under Employee Stock Purchase Plan (in shares)   14,991    
Issuance of stock under Employee Stock Purchase Plan 175   175  
Stock-based compensation 912   912  
Net loss $ (6,209)     (6,209)
Ending balance (in shares) at Mar. 31, 2021 16,925,680 16,925,680    
Ending balance at Mar. 31, 2021 $ 101,470 $ 17 $ 288,951 $ (187,498)