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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     1,056      
Issuance of shares for stock purchase plan     589      
Repurchases of common stock       (193)    
Unrealized gain on available-for-sale securities, net of deferred taxes 23       23  
Net income (loss) 998         998
Ending balance at Jun. 30, 2019 47,620 1 95,228 (3,625) 12 (43,996)
Beginning balance at Mar. 31, 2019 46,045 1 94,328 (3,625) (1) (44,658)
Stock-based compensation     542      
Issuance of shares for stock purchase plan     358      
Unrealized gain on available-for-sale securities, net of deferred taxes 13       13  
Net income (loss) 662         662
Ending balance at Jun. 30, 2019 47,620 1 95,228 (3,625) 12 (43,996)
Beginning balance at Dec. 31, 2019 47,904 1 96,622 (4,659) 8 (44,068)
Stock-based compensation     1,322      
Issuance of shares for stock purchase plan     91      
Repurchases of common stock       (608)    
Unrealized gain on available-for-sale securities, net of deferred taxes 8       8  
Net income (loss) (1,938)         (1,938)
Ending balance at Jun. 30, 2020 46,779 1 98,035 (5,267) 16 (46,006)
Beginning balance at Mar. 31, 2020 47,235 1 97,360 (4,849) (7) (45,270)
Stock-based compensation     654      
Issuance of shares for stock purchase plan     21      
Repurchases of common stock       (418)    
Unrealized gain on available-for-sale securities, net of deferred taxes 23       23  
Net income (loss) (736)         (736)
Ending balance at Jun. 30, 2020 $ 46,779 $ 1 $ 98,035 $ (5,267) $ 16 $ (46,006)