NET LOSS PER SHARE - Basic and diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
NET LOSS PER SHARE
Net income /(loss) (numerator), Basic (in dollars)	$ (6,302)	$ (41,131)	$ (12,692)	$ (69,199)
Net income /(loss) (numerator), Diluted (in dollars)	$ (6,302)	$ (41,131)	$ (12,692)	$ (69,199)
Weighted-average shares (denominator), basic (in shares)	43,663,112	43,718,748	43,667,385	43,713,967
Weighted-average shares (denominator), diluted (in shares)	43,663,112	43,718,748	43,667,385	43,713,967
Basic net loss per share (in dollars per share)	$ (0.14)	$ (0.94)	$ (0.29)	$ (1.58)
Diluted net loss per share (in dollars per share)	$ (0.14)	$ (0.94)	$ (0.29)	$ (1.58)