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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock and Additional Paid-in Capital
Treasury Stock
Accumulated Deficit
Beginning balance at Dec. 31, 2021 $ 44,173 $ 106,971 $ (5,364) $ (57,434)
Stock-based compensation   3,043    
Issuance of shares for stock purchase and option plans   235    
Net loss (5,439)     (5,439)
Ending balance at Sep. 30, 2022 42,012 110,249 (5,364) (62,873)
Beginning balance at Jun. 30, 2022 42,248 109,186 (5,364) (61,574)
Stock-based compensation   964    
Common stock withheld related to net share settlement of equity awards   167    
Issuance of shares for stock purchase and option plans   (68)    
Net loss (1,299)     (1,299)
Ending balance at Sep. 30, 2022 42,012 110,249 (5,364) (62,873)
Beginning balance at Dec. 31, 2022 39,825 111,282 (5,364) (66,093)
Stock-based compensation   3,342    
Common stock withheld related to net share settlement of equity awards   (690)    
Issuance of shares for stock purchase and option plans   232    
Net loss (6,944)     (6,944)
Ending balance at Sep. 30, 2023 35,765 114,166 (5,364) (73,037)
Beginning balance at Jun. 30, 2023 37,079 113,599 (5,364) (71,156)
Stock-based compensation   500    
Issuance of shares for stock purchase and option plans   67    
Net loss (1,881)     (1,881)
Ending balance at Sep. 30, 2023 $ 35,765 $ 114,166 $ (5,364) $ (73,037)