LEASES - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Weighted average remaining lease term and discount rate
Weighted average remaining operating lease term (years)	4 years 9 months 25 days		4 years 9 months 25 days		4 years 11 months 26 days
Weighted average discount rate for operating leases (percentage)	13.96%		13.96%		13.91%
Operating lease cost	$ 1,338	$ 1,304	$ 2,669	$ 2,576
Variable lease cost	211	147	423	212
Short-term lease cost	39	29	92	31
Lease, Cost	$ 1,588	$ 1,480	$ 3,184	$ 2,819