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Condensed Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance at Dec. 31, 2018 $ 45,147 $ 1 $ 93,583 $ (3,432) $ (11) $ (44,994)
Stock-based compensation     514      
Issuance of shares for stock purchase plans     231      
Repurchases of common stock       (193)    
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes 10       10  
Net income (loss) 337         337
Ending balance at Mar. 31, 2019 46,046 1 94,328 (3,625) (1) (44,657)
Beginning balance at Dec. 31, 2019 47,904 1 96,622 (4,659) 8 (44,068)
Stock-based compensation     668      
Issuance of shares for stock purchase plans     70      
Repurchases of common stock       (190)    
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes (15)       (15)  
Net income (loss) (1,202)         (1,202)
Ending balance at Mar. 31, 2020 $ 47,235 $ 1 $ 97,360 $ (4,849) $ (7) $ (45,270)