EQUITY, STOCK-BASED COMPENSATION AND LOSS PER SHARE - Basic and diluted net loss per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Mar. 31, 2022
EQUITY, STOCK-BASED COMPENSATION AND LOSS PER SHARE
Net loss	$ (9,994)	$ (87,323)	$ (6,087)	$ (83,047)	$ (97,317)	$ (89,134)
Weighted average common shares outstanding, basic (in thousands) (in shares)	25,687		25,315		25,645	23,197
Weighted average common shares outstanding, diluted (in thousands) (in shares)	25,687		25,315		25,645	23,197
Basic net loss per share (in dollars per share)	$ (0.39)		$ (0.24)		$ (3.79)	$ (3.84)
Diluted net loss per share (in dollar per share)	$ (0.39)		$ (0.24)		$ (3.79)	$ (3.84)