STOCK BASED COMPENSATION - Options activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Options Outstanding
Outstanding at beginning of period (in shares) | shares	4,704,888
Options granted (in shares) | shares	767,913
Options exercised (in shares) | shares	(47,602)
Forfeited (in shares) | shares	(357,833)
Expired (in shares) | shares	(141,688)
Outstanding at end of period (in shares) | shares	4,925,678	4,704,888
Exercisable at end of period (in shares) | shares	3,711,517
Nonvested at end of period (in shares) | shares	1,214,161
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 13.29
Options granted (in dollars per share) | $ / shares	2.80
Options exercised (in dollars per share) | $ / shares	1.04
Options forfeited (in dollars per share) | $ / shares	20.93
Options expired (in dollars per share) | $ / shares	31.65
Outstanding at end of period (in dollars per share) | $ / shares	1.99	$ 13.29
Exercisable at end of period (in dollars per share) | $ / shares	2.30
Nonvested at end of period (in dollars per share) | $ / shares	$ 1.05
Weighted-Average Remaining Contractual Term-in years
Outstanding	7 years 2 months 12 days	7 years 8 months 12 days
Exercisable	6 years 8 months 12 days
Nonvested	8 years 6 months
Aggregate Intrinsic Value
Options exercised (in dollars) | $	$ 21
Outstanding (in dollars) | $		$ 10,305