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Condensed Statements of Convertible Preferred Stock and Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Preferred Stock [Member]
Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Dec. 31, 2021 $ 1 $ 36,632 $ (21,284) $ 15,349
Balance, shares at Dec. 31, 2021 8,933,989        
Issuance of common stock upon exercise of stock options 26 26
Issuance of common stock upon exercise of stock options, shares   91,816        
Issuance of restricted stock awards 14 14
Issuance of restricted stock awards, shares   3,500        
Stock-based compensation expense 154 154
Net loss (3,003) (3,003)
Balance at Mar. 31, 2022 $ 1 36,826 (24,287) 12,540
Balance, shares at Mar. 31, 2022 9,029,305        
Balance at Dec. 31, 2022 $ 1 37,318 17 (31,173) 6,163
Balance, shares at Dec. 31, 2022 9,097,701        
Issuance of common stock upon exercise of stock options 6 $ 6
Issuance of common stock upon exercise of stock options, shares   3,547       3,547
Issuance of restricted stock awards 117 $ 117
Issuance of restricted stock awards, shares   30,000        
Stock-based compensation expense 244 244
Other comprehensive loss       (17)   (17)
Net loss (3,257) (3,257)
Balance at Mar. 31, 2023 $ 1 $ 37,685 $ (34,430) $ 3,256
Balance, shares at Mar. 31, 2023 9,131,248