STOCKHOLDERS’ EQUITY - Warrants (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Class of Warrant or Right [Line Items]
Number of warrants (in shares)	3,531	3,531
Weighted-average exercise price of warrants (in dollars per share)	$ 4.00	$ 4.00
Weighted-Average Remaining Exercise Period (years)	1 year 9 months 18 days	2 years
Aggregate Intrinsic Value	$ 71	$ 9,216
Warrants with $4.00 exercise price
Class of Warrant or Right [Line Items]
Weighted-average exercise price of warrants (in dollars per share)	$ 4.00
Number of warrants (in shares)	3,531