Condensed Consolidated Statements of Shareholders' Deficit - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Mar. 31, 2020		89,833,998
Beginning balance at Mar. 31, 2020	$ (108,277)	$ 2	$ 684,381	$ (1,646)	$ (791,014)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	7,812		7,812
Issuance of shares upon exercise of stock options (in shares)		303,014
Issuance of shares upon exercise of stock options	2,190		2,190
Foreign currency translation adjustment	(3,475)			(3,475)
Net loss	(32,860)				(32,860)
Ending balance (in shares) at Jun. 30, 2020		90,137,012
Ending balance at Jun. 30, 2020	$ (134,610)	$ 2	694,383	(5,121)	(823,874)
Beginning balance (in shares) at Mar. 31, 2021	91,000,869	91,000,869
Beginning balance at Mar. 31, 2021	$ (353,965)	$ 2	709,466	(17,285)	(1,046,148)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	11,262		11,262
Share-based compensation liabilities reclassified to equity upon settlement of awards	1,862		1,862
Share-based compensation expense reclassified to current liabilities	$ (1,377)		(1,377)
Issuance of shares upon exercise of stock options (in shares)	436,573	941,774
Issuance of shares upon exercise of stock options	$ 4,252		4,252
Net loss	$ (61,660)				(61,660)
Ending balance (in shares) at Jun. 30, 2021	91,942,643	91,942,643
Ending balance at Jun. 30, 2021	$ (399,626)	$ 2	$ 725,465	$ (17,285)	$ (1,107,808)