STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock-based compensation
Total stock-based compensation expense	$ 2,017	$ 1,698	$ 2,056
Unrecognized compensation cost	2,408
ESPP
Stock-based compensation
Total stock-based compensation expense	47	34	10
Stock options
Stock-based compensation
Total stock-based compensation expense	490	242	0
Unrecognized compensation cost	$ 1,507
Weighted-Average Amortization Period (Years)	2 years 9 months 18 days
RSUs
Stock-based compensation
Total stock-based compensation expense	$ 1,280	1,149	1,431
Unrecognized compensation cost	$ 574
Weighted-Average Amortization Period (Years)	6 months
RSAs
Stock-based compensation
Total stock-based compensation expense	$ 200	273	615
Unrecognized compensation cost	$ 327
Weighted-Average Amortization Period (Years)	2 years 7 months 6 days
General and administrative
Stock-based compensation
Total stock-based compensation expense	$ 2,017	$ 1,698	$ 2,056

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

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