Condensed Consolidated Statement of Shareholders' (Deficit) Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Public Offering	Public Offering Common Shares	Public Offering Additional Paid-in Capital	Cowen and Company, LLC Private Placement	Cowen and Company, LLC Private Placement Common Shares	Cowen and Company, LLC Private Placement Additional Paid-in Capital
Beginning balance (in shares) at Mar. 31, 2019		72,057,490
Beginning balance at Mar. 31, 2019	$ 4,334	$ 1	$ 505,851	$ 507	$ (502,025)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares (in shares)							17,424,243			106,494
Issuance of shares						$ 134,538	$ 1	$ 134,537	$ 2,546		$ 2,546
Share-based compensation expense	6,410		6,410
Capital contribution from former controlling shareholder — share-based compensation	42		42
Capital contribution from former controlling shareholder	106		106
Foreign currency translation adjustment	(819)			(819)
Issuance of shares upon exercise of stock options and vesting of restricted stock units (in shares)		34,399
Issuance of shares upon exercise of stock options and vesting of restricted stock units	314		314
Net loss	(67,904)				(67,904)
Ending balance (in shares) at Jun. 30, 2019		89,622,626
Ending balance at Jun. 30, 2019	$ 79,567	$ 2	649,806	(312)	(569,929)
Beginning balance (in shares) at Mar. 31, 2020	89,833,998	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
Foreign currency translation adjustment	(3,475)			(3,475)
Issuance of shares upon exercise of stock options and vesting of restricted stock units (in shares)		303,014
Issuance of shares upon exercise of stock options and vesting of restricted stock units	2,190		2,190
Net loss	$ (32,860)				(32,860)
Ending balance (in shares) at Jun. 30, 2020	90,137,012	90,137,012
Ending balance at Jun. 30, 2020	$ (134,610)	$ 2	$ 694,383	$ (5,121)	$ (823,874)