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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, 2019   12,560,990    
Beginning balance at Dec. 31, 2019 55,659 $ 13 220,248 (164,602)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net loss (13,234)      
Ending balance (in shares) at Sep. 30, 2020   12,652,113    
Ending balance at Sep. 30, 2020 44,474 $ 13 222,297 (177,836)
Beginning balance (in shares) at Mar. 31, 2020   12,627,056    
Beginning balance at Mar. 31, 2020 50,537 $ 13 220,689 (170,165)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in shares)   3,599    
Exercise of stock options 2   2  
Stock-based compensation 647   647  
Net exercise of common stock warrants (in shares)   9,754    
Net exercise of common stock warrants 18   18  
Net loss (3,363)     (3,363)
Ending balance (in shares) at Jun. 30, 2020   12,640,409    
Ending balance at Jun. 30, 2020 47,841 $ 13 221,356 (173,528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in shares)   55    
Exercise of stock options 0      
Issuance of stock under Employee Stock Purchase Plan (in shares)   11,649    
Issuance of stock under Employee Stock Purchase Plan 142   142  
Stock-based compensation 799   799  
Net loss (4,308)     (4,308)
Ending balance (in shares) at Sep. 30, 2020   12,652,113    
Ending balance at Sep. 30, 2020 $ 44,474 $ 13 222,297 (177,836)
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    
Ending balance at Mar. 31, 2021 $ 101,470 $ 17 288,951 (187,498)
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]        
Net exercise of common stock warrants (in shares) 17,719      
Net loss $ (19,798)      
Ending balance (in shares) at Sep. 30, 2021 16,164,232 16,164,232    
Ending balance at Sep. 30, 2021 $ 90,803 $ 16 291,874 (201,087)
Beginning balance (in shares) at Mar. 31, 2021   16,925,680    
Beginning balance at Mar. 31, 2021 101,470 $ 17 288,951 (187,498)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Retirement of common stock in exchange for common stock warrant (in shares)   (804,951)    
Retirement of common stock in exchange for common stock warrant (12,775) $ (1) (12,774)  
Issuance of common stock warrant in exchange for retirement of common stock 12,775   12,775  
Exercise of stock options (in shares)   6,055    
Exercise of stock options 35   35  
Stock-based compensation 1,285   1,285  
Net loss (6,410)     (6,410)
Ending balance (in shares) at Jun. 30, 2021   16,126,784    
Ending balance at Jun. 30, 2021 96,380 $ 16 290,272 (193,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in shares)   1,752    
Exercise of stock options 1   1  
Issuance of stock under Employee Stock Purchase Plan (in shares)   17,977    
Issuance of stock under Employee Stock Purchase Plan 215   215  
Stock-based compensation 1,354   1,354  
Net exercise of common stock warrants (in shares)   17,719    
Net exercise of common stock warrants 32   32  
Net loss $ (7,179)     (7,179)
Ending balance (in shares) at Sep. 30, 2021 16,164,232 16,164,232    
Ending balance at Sep. 30, 2021 $ 90,803 $ 16 $ 291,874 $ (201,087)