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Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Beginning balance, value at Dec. 31, 2019 $ 16 $ 128,669 $ (116,935) $ 11,750
Beginning balance, shares at Dec. 31, 2019 16,041,650      
Equity compensation 409 409
Issuance of common stock, net of costs $ 2 10,567 10,569
Issuance of common stock, net of costs, shares 1,769,230      
Exercise of stock options, net of cashless exercise shares 203 203
Exercise of stock options, net of cashless exercise of shares, shares 689,901      
Shares withheld for withholding taxes (1,475) (1,475)
Shares withheld for withholding taxes, shares (180,844)      
Issuance of shares for vested restricted stock grants
Issuance of shares for vested restricted stock grants, shares 24,778      
Exercise of warrants 112 112
Exercise of warrants, shares 50,750      
Settlement of executive bonuses with issuance of restricted stock units 85 85
Settlement of executive bonuses with issuance of restricted stock units, shares 14,993      
Exercise of liability awards 3,042 3,042
Net loss (2,484) (2,484)
Ending balance, value at Dec. 31, 2020 $ 18 141,612 (119,419) 22,211
Ending balance, shares at Dec. 31, 2020 18,410,458      
Equity compensation 3,068 3,068
Exercise of stock options, net of cashless exercise shares $ 1 1,756 1,757
Exercise of stock options, net of cashless exercise of shares, shares 208,741      
Issuance of shares for vested restricted stock grants
Issuance of shares for vested restricted stock grants, shares 32,170      
Exercise of warrants 19 19
Exercise of warrants, shares 9,000      
Net loss (7,478) (7,478)
Ending balance, value at Dec. 31, 2021 $ 19 $ 146,455 $ (126,897) $ 19,577
Ending balance, shares at Dec. 31, 2021 18,660,369