NET LOSS PER SHARE - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net loss	$ (42,324)	$ (43,906)	$ (38,413)	$ (41,913)	$ (86,230)	$ (80,326)
Weighted average common shares outstanding - basic (in shares)	112,422		104,620		111,180	104,116
Weighted average common shares outstanding - diluted (in shares)	112,422		104,620		111,180	104,116
Net loss per share:
Basic (in dollars per share)	$ (0.38)		$ (0.37)		$ (0.78)	$ (0.77)
Diluted (in dollars per share)	$ (0.38)		$ (0.37)		$ (0.78)	$ (0.77)