CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Ordinary Shares [Member]	Additional paid in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Beginning balance at Mar. 31, 2021	$ (35,581)	$ 540,813	$ 38,116	$ (14,598)	$ (599,912)
Beginning balance, Shares at Mar. 31, 2021		2,531,610
Issue of shares upon exercise of incentive share options and vesting of RSUs	(80)	$ (80)
Issue of shares upon exercise of incentive share options and vesting of RSUs, Shares		8,180
Net loss	(54,397)				(54,397)
Change in fair value of effective portion of foreign currency cash flow hedges	(343)			(343)
Change in unrealized gain in/on short-term investments	(193)			(193)
Foreign currency cumulative translation adjustment	2,010			2,010
Provision for pension benefit obligation	29			29
Other comprehensive loss	1,503			1,503
Stock-based compensation	3,227		3,227
Ending balance at Sep. 30, 2021	(85,328)	$ 540,733	41,343	(13,095)	(654,309)
Ending balance, Shares at Sep. 30, 2021		2,539,790
Beginning balance at Jun. 30, 2021	(61,189)	$ 540,734	39,939	(14,658)	(627,204)
Beginning balance, Shares at Jun. 30, 2021		2,538,179
Issue of shares upon exercise of incentive share options and vesting of RSUs	(1)	$ (1)
Issue of shares upon exercise of incentive share options and vesting of RSUs, Shares		1,611
Net loss	(27,105)				(27,105)
Change in fair value of effective portion of foreign currency cash flow hedges	(231)			(231)
Change in unrealized gain in/on short-term investments	(72)			(72)
Foreign currency cumulative translation adjustment	1,852			1,852
Provision for pension benefit obligation	14			14
Other comprehensive loss	1,563			1,563
Stock-based compensation	1,404		1,404
Ending balance at Sep. 30, 2021	(85,328)	$ 540,733	41,343	(13,095)	(654,309)
Ending balance, Shares at Sep. 30, 2021		2,539,790
Beginning balance at Mar. 31, 2022	$ (144,098)	$ 540,736	46,399	(6,191)	(725,042)
Beginning balance, Shares at Mar. 31, 2022	2,565,284	2,565,284
Issue of shares and pre-funded warrants, net of issue costs, Amount	$ 17,903	$ 17,903
Issue of shares and pre-funded warrants, net of issue costs, Shares		811,458
Issue of shares upon exercise of incentive share options and vesting of RSUs, Shares		19,376
Net loss	(84,794)				(84,794)
Change in fair value of effective portion of foreign currency cash flow hedges	0
Change in unrealized gain in/on short-term investments	26			26
Foreign currency cumulative translation adjustment	27,176			27,176
Provision for pension benefit obligation	28			28
Other comprehensive loss	27,230			27,230
Stock-based compensation	1,669		1,669
Ending balance at Sep. 30, 2022	$ (182,090)	$ 558,639	48,068	21,039	(809,836)
Ending balance, Shares at Sep. 30, 2022	3,396,118	3,396,118
Beginning balance at Jun. 30, 2022	$ (151,078)	$ 558,639	48,033	6,160	(763,910)
Beginning balance, Shares at Jun. 30, 2022		3,392,088
Issue of shares upon exercise of incentive share options and vesting of RSUs, Shares		4,030
Net loss	(45,926)				(45,926)
Change in fair value of effective portion of foreign currency cash flow hedges	0
Change in unrealized gain in/on short-term investments	19			19
Foreign currency cumulative translation adjustment	14,846			14,846
Provision for pension benefit obligation	14			14
Other comprehensive loss	14,879			14,879
Stock-based compensation	35		35
Ending balance at Sep. 30, 2022	$ (182,090)	$ 558,639	$ 48,068	$ 21,039	$ (809,836)
Ending balance, Shares at Sep. 30, 2022	3,396,118	3,396,118