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Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock and additional paid-in capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance at Dec. 31, 2019 $ 47,904 $ 96,623 $ (4,659) $ 8 $ (44,068)
Stock-based compensation   2,564      
Replacement awards issued in relation to acquisition   0      
Issuance of shares for stock purchase plans   1,169      
Repurchases of common stock     (608)    
Unrealized loss on available-for-sale securities, net of deferred taxes (8)     (8)  
Net loss (3,279)       (3,279)
Ending balance at Dec. 31, 2020 47,742 100,356 (5,267) 0 (47,347)
Stock-based compensation   4,049      
Replacement awards issued in relation to acquisition   40      
Issuance of shares for stock purchase plans   2,526      
Repurchases of common stock     (97)    
Unrealized loss on available-for-sale securities, net of deferred taxes 0     0  
Net loss (10,087)       (10,087)
Ending balance at Dec. 31, 2021 $ 44,173 $ 106,971 $ (5,364) $ 0 $ (57,434)