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 and release of restricted stock units (in shares)		303,014
Issuance of shares upon exercise of stock options and release of restricted stock units	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, 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]
Net loss	(99,922)
Ending balance (in shares) at Sep. 30, 2020		90,581,003
Ending balance at Sep. 30, 2020	(199,779)	$ 2	702,695	(11,540)	(890,936)
Beginning balance (in shares) at Jun. 30, 2020		90,137,012
Beginning balance at Jun. 30, 2020	(134,610)	$ 2	694,383	(5,121)	(823,874)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	6,924		6,924
Issuance of shares upon exercise of stock options and release of restricted stock units (in shares)		443,991
Issuance of shares upon exercise of stock options and release of restricted stock units	1,388		1,388
Foreign currency translation adjustment	(6,419)			(6,419)
Net loss	(67,062)				(67,062)
Ending balance (in shares) at Sep. 30, 2020		90,581,003
Ending balance at Sep. 30, 2020	$ (199,779)	$ 2	702,695	(11,540)	(890,936)
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 and release of restricted stock units (in shares)		941,774
Issuance of shares upon exercise of stock options and release of restricted stock units	4,252		4,252
Net loss	(61,660)				(61,660)
Ending balance (in shares) at Jun. 30, 2021		91,942,643
Ending balance at Jun. 30, 2021	$ (399,626)	$ 2	725,465	(17,285)	(1,107,808)
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]
Issuance of shares upon exercise of stock options and release of restricted stock units (in shares)	1,255,578
Net loss	$ (83,251)
Ending balance (in shares) at Sep. 30, 2021	93,077,789	93,077,789
Ending balance at Sep. 30, 2021	$ (382,927)	$ 2	763,755	(17,285)	(1,129,399)
Beginning balance (in shares) at Jun. 30, 2021		91,942,643
Beginning balance at Jun. 30, 2021	(399,626)	$ 2	725,465	(17,285)	(1,107,808)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	11,863		11,863
Share-based compensation liabilities reclassified to equity upon settlement of awards	16,297		16,297
Share-based compensation expense reclassified to current liabilities	(915)		(915)
Issuance of shares upon exercise of stock options and release of restricted stock units (in shares)		1,135,146
Issuance of shares upon exercise of stock options and release of restricted stock units	11,045		11,045
Net loss	$ (21,591)				(21,591)
Ending balance (in shares) at Sep. 30, 2021	93,077,789	93,077,789
Ending balance at Sep. 30, 2021	$ (382,927)	$ 2	$ 763,755	$ (17,285)	$ (1,129,399)