SHARE-BASED COMPENSATION PLANS - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Outstanding Stock Options
Beginning balance (in shares)	1,510,968	567,842
Granted (in shares)	1,023,000	1,352,595
Exercised (in shares)	0	0
Forfeited (in shares)	(393,350)	(409,469)
Ending balance (in shares)	2,140,618	1,510,968	567,842
Exercisable at end of period (in shares)	718,123
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 27.36	$ 76.25
Granted (in dollars per share)	2.80	7.59
Exercised (in dollars per share)
Forfeited (in dollars per share)	30.66	29.86
Ending balance (in dollars per share)	15.01	$ 27.36	$ 76.25
Exercisable at end of period (in dollars per share)	$ 36.42
Outstanding Stock Options, Other Disclosures
Weighted-average remaining contractual term, outstanding (in years)	8 years 5 months 23 days	8 years 2 months 8 days	7 years 9 months 25 days
Weighted-average remaining contractual term, exercisable (in years)	6 years 11 months 23 days
Aggregate intrinsic value, outstanding	$ 0	$ 379	$ 12
Aggregate intrinsic value, exercisable	$ 0