Condensed Consolidated Statement of Shareholders' (Deficit) Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (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, 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]
Net loss	(138,472)
Ending balance (in shares) at Sep. 30, 2019		89,623,564
Ending balance at Sep. 30, 2019	17,254	$ 2	657,780	(31)	(640,497)
Beginning balance (in shares) at Jun. 30, 2019		89,622,626
Beginning balance at Jun. 30, 2019	79,567	$ 2	649,806	(312)	(569,929)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares (in shares)							0
Issuance of shares						$ (80)	$ 0	$ (80)
Share-based compensation expense	7,879		7,879
Capital contribution from former controlling shareholder — share-based compensation	52		52
Capital contribution from former controlling shareholder	123		123
Foreign currency translation adjustment	281			281
Issuance of shares upon exercise of stock options and vesting of restricted stock units (in shares)		938
Issuance of shares upon exercise of stock options and vesting of restricted stock units	0		0
Net loss	(70,568)				(70,568)
Ending balance (in shares) at Sep. 30, 2019		89,623,564
Ending balance at Sep. 30, 2019	$ 17,254	$ 2	657,780	(31)	(640,497)
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
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	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	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
Foreign currency translation adjustment	(6,419)			(6,419)
Issuance of shares upon exercise of stock options and vesting of restricted stock units (in shares)		443,991
Issuance of shares upon exercise of stock options and vesting of restricted stock units	1,388		1,388
Net loss	$ (67,062)				(67,062)
Ending balance (in shares) at Sep. 30, 2020	90,581,003	90,581,003
Ending balance at Sep. 30, 2020	$ (199,779)	$ 2	$ 702,695	$ (11,540)	$ (890,936)