STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based compensation
Total stock-based compensation expense	$ 1,698	$ 2,056	$ 3,233
Unrecognized compensation cost	2,048
ESPP
Stock-based compensation
Total stock-based compensation expense	34	10	46
Stock options
Stock-based compensation
Total stock-based compensation expense	242	0	305
Unrecognized compensation cost	$ 1,328
Weighted-Average Amortization Period (Years)	3 years 4 months 24 days
RSUs
Stock-based compensation
Total stock-based compensation expense	$ 1,149	1,431	1,650
Unrecognized compensation cost	$ 351
Weighted-Average Amortization Period (Years)	3 months 18 days
RSAs
Stock-based compensation
Total stock-based compensation expense	$ 273	615	1,920
Unrecognized compensation cost	$ 369
Weighted-Average Amortization Period (Years)	2 years 4 months 24 days
Market-based RSUs (PSUs)
Stock-based compensation
Total stock-based compensation expense	$ 0	0	(224)
Market-based RSAs (PSAs)
Stock-based compensation
Total stock-based compensation expense	0	0	(464)
Market-based awards \| Senior Management
Stock-based compensation
Stock based compensation reversed			1,700
General and administrative
Stock-based compensation
Total stock-based compensation expense	$ 1,698	$ 2,056	$ 3,233

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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