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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Total
Balance at beginning at Dec. 31, 2016 $ 312 $ 97,359 $ (94,880) $ 2,791
Balance at beginning (in shares) at Dec. 31, 2016 31,229,996      
Sale of common stock $ 25 975   1,000
Sale of common stock (in shares) 2,500,000      
Stock option exercises $ 1 46   47
Stock option exercises (in shares) 117,797      
Stock-based compensation   183   183
Net loss     (789) (789)
Balance at ending at Dec. 31, 2017 $ 338 98,563 (95,669) 3,232
Balance at ending (in shares) at Dec. 31, 2017 33,847,793      
Stock option exercises $ 1 28   29
Stock option exercises (in shares) 63,999      
Stock-based compensation   204   204
Net loss     (2,081) (2,081)
Balance at ending at Dec. 31, 2018 $ 339 $ 98,795 $ (97,750) $ 1,384
Balance at ending (in shares) at Dec. 31, 2018 33,911,792