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EARNINGS PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net (loss) income $ (176) $ 40 $ (13,648) $ (2,193)
Less: allocation to preferred stockholders 0 (24) 0 0
Net (loss) income allocated to common stockholders, basic (176) 16 (13,648) (2,193)
Net (loss) income allocated to common stockholders, diluted $ (176) $ 16 $ (13,648) $ (2,193)
Denominator for basic net income per common share - weighted-average shares (in shares) 13,172 12,439 13,045 12,441
Effect of dilutive securities        
Convertible preferred stock (in shares) 0 0 0 0
Stock options (in shares) 0 3,764 0 0
Denominator for dilutive net income per common share - weighted-average shares (in shares) 13,172 16,203 13,045 12,441
Basic loss per common share (in usd per share) $ (0.01) $ 0 $ (1.05) $ (0.18)
Diluted loss per common share (in usd per share) $ (0.01) $ 0 $ (1.05) $ (0.18)