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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, 2018 $ 45,147 $ 93,584 $ (3,432) $ (11) $ (44,994)
Stock-based compensation   2,204      
Issuance of shares for stock purchase plans   835      
Repurchases of common stock     (1,227)    
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes 19     19  
Net income (loss) 926       926
Ending balance at Dec. 31, 2019 47,904 96,623 (4,659) 8 (44,068)
Stock-based compensation   2,564      
Issuance of shares for stock purchase plans   1,169      
Repurchases of common stock     (608)    
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes (8)     $ (8)  
Net income (loss) (3,279)       (3,279)
Ending balance at Dec. 31, 2020 $ 47,742 $ 100,356 $ (5,267)   $ (47,347)