NET LOSS PER SHARE - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net loss	$ (43,571)	$ (42,324)	$ (43,906)	$ (40,225)	$ (38,413)	$ (41,913)	$ (129,801)	$ (120,551)
Weighted average common shares outstanding - basic (in shares)	113,510			106,641			111,960	104,961
Weighted average common shares outstanding - diluted (in shares)	113,510			106,641			111,960	104,961
Net loss per share:
Basic (in dollars per share)	$ (0.38)			$ (0.38)			$ (1.16)	$ (1.15)
Diluted (in dollars per share)	$ (0.38)			$ (0.38)			$ (1.16)	$ (1.15)