STOCK BASED COMPENSATION - Options activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Options Outstanding
Outstanding at beginning of period (in shares)	4,704,888
Options granted (in shares)	767,913
Forfeited (in shares)	(271,095)
Expired (in shares)	(132,269)
Outstanding at end of period (in shares)	5,069,437	4,704,888
Exercisable at end of period (in shares)	3,613,024
Nonvested at end of period (in shares)	1,456,413
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 13.29
Options granted (in dollars per share)	2.80
Options forfeited (in dollars per share)	26.64
Options expired (in dollars per share)	32.85
Outstanding at end of period (in dollars per share)	10.47	$ 13.29
Exercisable at end of period (in dollars per share)	9.35
Nonvested at end of period (in dollars per share)	$ 13.26
Weighted-Average Remaining Contractual Term-in years
Outstanding	7 years 4 months 24 days	7 years 8 months 12 days
Exercisable	7 years
Nonvested	8 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding (in dollars)		$ 10,305