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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, 2017 $ 46,225 $ 1 $ 89,907 $ (1,257) $ (17) $ (42,409)
Stock-based compensation     2,128      
Exercise of stock options     300      
Common stock repurchases       (1,323)    
Unrealized gain on available-for-sale securities, net of deferred taxes 7       7  
Net income (loss) (4,296)         (4,296)
Ending balance at Jun. 30, 2018 43,041 1 92,335 (2,580) (10) (46,705)
Beginning balance at Mar. 31, 2018 44,798 1 90,370 (2,037) (21) (43,515)
Stock-based compensation     1,769      
Exercise of stock options     196      
Common stock repurchases       (543)    
Unrealized gain on available-for-sale securities, net of deferred taxes 11       11  
Net income (loss) (3,190)         (3,190)
Ending balance at Jun. 30, 2018 43,041 1 92,335 (2,580) (10) (46,705)
Beginning balance at Dec. 31, 2018 45,147 1 93,583 (3,432) (11) (44,994)
Stock-based compensation     1,056      
Exercise of stock options     589      
Common stock repurchases       (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      
Exercise of stock options     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)