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Condensed Statements of Stockholders' Equity (Unaudited) - 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   1,605      
Issuance of shares for stock purchase plan   779      
Repurchases of common stock     (799)    
Other comprehensive income (loss)       24  
Net income (loss) 863       863
Ending balance at Sep. 30, 2019 47,619 95,968 (4,231) 13 (44,131)
Beginning balance at Jun. 30, 2019 47,620 95,229 (3,625) 12 (43,996)
Stock-based compensation   549      
Issuance of shares for stock purchase plan   190      
Repurchases of common stock     (606)    
Other comprehensive income (loss)       1  
Net income (loss) (135)       (135)
Ending balance at Sep. 30, 2019 47,619 95,968 (4,231) 13 (44,131)
Beginning balance at Dec. 31, 2019 47,904 96,623 (4,659) 8 (44,068)
Stock-based compensation   1,956      
Issuance of shares for stock purchase plan   1,018      
Repurchases of common stock     (608)    
Other comprehensive income (loss)       (7)  
Net income (loss) (2,199)       (2,199)
Ending balance at Sep. 30, 2020 48,064 99,597 (5,267) 1 (46,267)
Beginning balance at Jun. 30, 2020 46,779 98,036 (5,267) 16 (46,006)
Stock-based compensation   633      
Issuance of shares for stock purchase plan   928      
Other comprehensive income (loss)       (15)  
Net income (loss) (261)       (261)
Ending balance at Sep. 30, 2020 $ 48,064 $ 99,597 $ (5,267) $ 1 $ (46,267)