CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Cumulative Effect of Accounting Changes [Member]	Ordinary Shares [Member]	Additional paid in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Cumulative Effect of Accounting Changes [Member]
Beginning balance at Mar. 31, 2019	$ 1,714		$ 368,958	$ 28,665	$ (14,884)	$ (381,025)
Beginning balance, Shares at Mar. 31, 2019			65,900,447
Issue of shares upon exercise of incentive share options and vesting of RSU's, Amount	377		$ 377
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares			466,259
Net loss	(50,561)					(50,561)
Change in the fair value of foreign currency cash flow hedges	(278)				(278)
Change in unrealized gain on short-term investments	194				194
Foreign currency gain (loss) on:
Long-term investment nature intra-entity balances	10,406				10,406
Retranslation of foreign entities	(11,431)				(11,431)
Provision for pension benefit obligation	96				96
Other comprehensive loss	(1,013)				(1,013)
Stock-based compensation	2,179			2,179
Ending balance at Sep. 30, 2019	(46,941)	$ 363	$ 369,335	30,844	(15,897)	(431,223)	$ 363
Ending balance, Shares at Sep. 30, 2019			66,366,706
Beginning balance at Jun. 30, 2019	(21,192)		$ 369,021	29,843	(15,823)	(404,233)
Beginning balance, Shares at Jun. 30, 2019			66,212,893
Issue of shares upon exercise of incentive share options and vesting of RSU's, Amount	314		$ 314
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares			153,813
Net loss	(26,990)					(26,990)
Change in the fair value of foreign currency cash flow hedges	(158)				(158)
Change in unrealized gain on short-term investments	47				47
Foreign currency gain (loss) on:
Long-term investment nature intra-entity balances	2,118				2,118
Retranslation of foreign entities	(2,129)				(2,129)
Provision for pension benefit obligation	48				48
Other comprehensive loss	(74)				(74)
Stock-based compensation	1,001			1,001
Ending balance at Sep. 30, 2019	(46,941)	$ 363	$ 369,335	30,844	(15,897)	(431,223)	$ 363
Ending balance, Shares at Sep. 30, 2019			66,366,706
Beginning balance at Mar. 31, 2020	$ (5,527)		$ 459,931	33,132	(15,155)	(483,435)
Beginning 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	153		$ 153
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares			273,008
Net loss	(40,404)					(40,404)
Change in the fair value of foreign currency cash flow hedges	276				276
Change in unrealized gain on short-term investments	(483)				(483)
Foreign currency gain (loss) on:
Long-term investment nature intra-entity balances	844				844
Retranslation of foreign entities	(4,145)				(4,145)
Provision for pension benefit obligation	27				27
Other comprehensive loss	(3,481)				(3,481)
Stock-based compensation	2,284			2,284
Ending balance at Sep. 30, 2020	$ 33,710		$ 540,769	35,416	(18,636)	(523,839)
Ending balance, Shares at Sep. 30, 2020	100,965,451		100,965,451
Beginning balance at Jun. 30, 2020	$ (30,185)		$ 459,990	34,092	(15,403)	(508,864)
Beginning balance, Shares at Jun. 30, 2020			80,593,440
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	94		$ 94
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares			77,894
Net loss	(14,975)					(14,975)
Change in the fair value of foreign currency cash flow hedges	279				279
Change in unrealized gain on short-term investments	(79)				(79)
Foreign currency gain (loss) on:
Long-term investment nature intra-entity balances	(3,841)				(3,841)
Retranslation of foreign entities	394				394
Provision for pension benefit obligation	14				14
Other comprehensive loss	(3,233)				(3,233)
Stock-based compensation	1,324			1,324
Ending balance at Sep. 30, 2020	$ 33,710		$ 540,769	$ 35,416	$ (18,636)	$ (523,839)
Ending balance, Shares at Sep. 30, 2020	100,965,451		100,965,451