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, 2018	$ (14,631)	$ 253,934	$ 23,708	$ (16,634)	$ (275,639)
Beginning balance, Shares at Mar. 31, 2018		45,646,424
Issue of shares, net of issue costs, Amount	113,724	$ 113,724
Issue of shares, net of issue costs, Shares		19,635,068
Issue of shares upon exercise of incentive share options and vesting of RSU's, Amount	1,300	$ 1,300
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares		618,955
Net loss	(105,386)				(105,386)
Change in the fair value of the effective portion of foreign currency cash flow hedges	(123)			(123)
Change in unrealized gain on short-term investments	796			796
Foreign currency gain (loss) on:
Long-term investment nature intra-entity balances	5,074			5,074
Retranslation of foreign entities	(3,110)			(3,110)
Provision for pension benefit obligation	(887)			(887)
Other comprehensive loss	1,750			1,750
Cumulative effect of accounting changes at Mar. 31, 2019	1,714	$ 368,958	28,665	(14,884)	(381,025)
Ending balance, Shares at Mar. 31, 2019		65,900,447
Issue of shares, net of issue costs, Amount	90,528	$ 90,528
Issue of shares, net of issue costs, Shares		13,800,000
Issue of shares upon exercise of incentive share options and vesting of RSU's, Amount	445	$ 445
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares		697,879
Net loss	(102,773)				(102,773)
Change in the fair value of the effective portion of foreign currency cash flow hedges	(157)			(157)
Change in unrealized gain on short-term investments	554			554
Foreign currency gain (loss) on:
Long-term investment nature intra-entity balances	18,394			18,394
Retranslation of foreign entities	(21,096)			(21,096)
Provision for pension benefit obligation	2,034			2,034
Other comprehensive loss	(271)			(271)
Stock-based compensation	4,467		4,467
Cumulative effect of accounting changes at Mar. 31, 2020	$ (5,527)	$ 459,931	33,132	(15,155)	(483,435)
Ending balance, Shares at Mar. 31, 2020	80,398,326	80,398,326
Issue of shares, net of issue costs, Amount	$ 80,685	$ 80,685
Issue of shares, net of issue costs, Shares		20,294,117
Issue of shares upon exercise of incentive share options and vesting of RSU's, Amount	197	$ 197
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares		571,969
Net loss	(108,470)				(108,470)
Change in the fair value of the effective portion of foreign currency cash flow hedges	582			582
Change in unrealized gain on short-term investments	(898)			(898)
Foreign currency gain (loss) on:
Long-term investment nature intra-entity balances	(27,251)			(27,251)
Retranslation of foreign entities	26,035			26,035
Provision for pension benefit obligation	622			622
Other comprehensive loss	(910)			(910)
Stock-based compensation	4,984		4,984
Cumulative effect of accounting changes at Mar. 31, 2021	$ (29,041)	$ 540,813	$ 38,116	$ (16,065)	$ (591,905)
Ending balance, Shares at Mar. 31, 2021	101,264,412	101,264,412