RESTRUCTURING CHARGES - Summary of Accrued Liability for the Restructuring and Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2022
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	$ 667	$ 682	$ 682
Restructuring charges	4,766	1,716
Cash payment	(3,005)	(1,442)
Non-cash charges	(1,766)	(289)
Accrued liability ending balance	662	667	662
Personnel related costs
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	403	418	418
Restructuring charges	1,878	260
Cash payment	(1,883)	(275)
Non-cash charges	0	0
Accrued liability ending balance	398	403	398
Facilities & Exit Costs
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	264	264	264
Restructuring charges	1,122	1,167
Cash payment	(1,122)	(1,167)
Non-cash charges	0	0
Accrued liability ending balance	264	264	264
Facility and Other Costs
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	0	0	0
Restructuring charges	1,766	289
Cash payment	0	0
Non-cash charges	(1,766)	(289)
Accrued liability ending balance	$ 0	$ 0	$ 0