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STOCK-BASED COMPENSATION - Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Number of Shares
Outstanding (in shares)	5,409,771
Granted (in shares)	0
Exercised (in shares)	0
Forfeited (in shares)	0
Outstanding (in shares)	5,409,771	5,409,771
Vested and expected to vest (in shares)	5,409,771
Exercisable (in shares)	5,040,526
Weighted Average Exercise Price Per Shares
Outstanding (in usd per share)	$ 1,270
Granted (in usd per share)	0
Exercised (in usd per share)	0
Forfeited (in usd per share)	0
Outstanding (in usd per share)	1,270	$ 1,270
Vested and expected to vest (in usd per share)	1,270
Exercisable (in usd per share)	$ 980
Weighted Average Remaining Contractual Term
Outstanding, weighted average remaining contractual term	4 years 1 month 6 days	4 years 1 month 6 days
Vested and expected to vest, weighted average remaining contractual term	5 years 1 month 6 days
Exercisable, weighted average remaining contractual term	3 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding, aggregate intrinsic value	$ 34,187	$ 37,542
Vested and expected to vest, aggregate intrinsic value	34,187
Exercisable, aggregate intrinsic value	$ 33,327

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