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CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020   18,410,458    
Beginning balance at Dec. 31, 2020 $ 22,211 $ 18 $ 141,612 $ (119,419)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 2,270   2,270  
Exercise of stock options, net of cashless exercise of 58,122 shares and 92,634 shares withheld (in shares)   206,545    
Exercise of stock options, net of cashless exercise of 58,122 shares and 92,634 shares withheld 1,756 $ 1 1,755  
Exercise of warrants (in shares)   9,000    
Exercise of warrants 20   20  
Issuance of shares for vested restricted stock grants (in shares)   17,278    
Net loss (6,486)     (6,486)
Ending balance (in shares) at Sep. 30, 2021   18,643,281    
Ending balance at Sep. 30, 2021 19,771 $ 19 145,657 (125,905)
Beginning balance (in shares) at Jun. 30, 2021   18,634,918    
Beginning balance at Jun. 30, 2021 20,158 $ 19 145,018 (124,879)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 639   639  
Issuance of shares for vested restricted stock grants (in shares)   8,363    
Net loss (1,026)     (1,026)
Ending balance (in shares) at Sep. 30, 2021   18,643,281    
Ending balance at Sep. 30, 2021 19,771 $ 19 145,657 (125,905)
Beginning balance (in shares) at Dec. 31, 2021   18,660,369    
Beginning balance at Dec. 31, 2021 19,577 $ 19 146,455 (126,897)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 2,045   2,045  
Issuance of shares for vested restricted stock grants (in shares)   270,143    
Net loss (3,290)     (3,290)
Ending balance (in shares) at Sep. 30, 2022   18,930,512    
Ending balance at Sep. 30, 2022 18,332 $ 19 148,500 (130,187)
Beginning balance (in shares) at Jun. 30, 2022   18,875,580    
Beginning balance at Jun. 30, 2022 18,360 $ 19 147,804 (129,463)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 696   696  
Issuance of shares for vested restricted stock grants (in shares)   54,932    
Net loss (724)     (724)
Ending balance (in shares) at Sep. 30, 2022   18,930,512    
Ending balance at Sep. 30, 2022 $ 18,332 $ 19 $ 148,500 $ (130,187)