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EARNINGS (LOSS) PER SHARE - Computation of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
EPS - basic and diluted:    
Loss per share $ (0.07) $ (0.17)
EPS numerator - basic and diluted:    
Net loss $ (203) $ (511)
EPS denominator:    
Weighted-average common stock outstanding - basic (in shares) 2,891 3,065
Common stock equivalents: stock options and restricted stock units 0 0
Weighted-average number of common stock outstanding - diluted (in shares) 2,891 3,065