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NET LOSS PER SHARE - Components of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Numerator
Loss from continuing operations	$ (16,311)	$ (42,291)
Income from discontinued operations	0	72,292
Net income (loss)	$ (16,311)	$ 30,001
Denominator
Weighted-average shares of common stock outstanding, basic and diluted (in shares)	15,910	15,511
Basic and diluted income (loss) per share
Basic and diluted loss from continuing operations (in USD per share)	$ (1.03)	$ (2.73)
Basic and diluted income from discontinuing operations (in USD per share)	0.00	4.66
Basic and diluted income (loss) (in USD per share)	$ (1.03)	$ 1.93

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