NET LOSS PER COMMON SHARE - EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss attributable to common stockholders-basic	$ (25,857)	$ (25,828)	$ (48,978)	$ (50,007)
Net loss attributable to common stockholders-diluted	$ (25,857)	$ (25,828)	$ (48,978)	$ (50,007)
Denominator:
Weighted-average common stock outstanding-basic (in shares)	26,901,069	26,082,525	26,560,185	25,114,508
Weighted-average common stock outstanding-diluted (in shares)	26,901,069	26,082,525	26,560,185	25,114,508
Net loss per share attributable to common stockholders-basic (in dollars per share)	$ (0.96)	$ (0.99)	$ (1.84)	$ (1.99)
Net loss per share attributable to common stockholders-diluted (in dollars per share)	$ (0.96)	$ (0.99)	$ (1.84)	$ (1.99)