NET LOSS PER SHARE - Computation of Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net loss	$ (21,654)	$ (22,930)	$ (25,507)	$ (35,077)	$ (34,351)	$ (30,301)	$ (70,091)	$ (99,729)
Weighted average common shares outstanding, basic (in shares)	36,346,181			36,219,137			36,304,050	36,175,249
Weighted average common shares outstanding, diluted (in shares)	36,346,181			36,219,137			36,304,050	36,175,249
Net loss per share, basic (in dollars per share)	$ (0.60)			$ (0.97)			$ (1.93)	$ (2.76)
Net loss per share, diluted (in dollars per share)	$ (0.60)			$ (0.97)			$ (1.93)	$ (2.76)