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, 2017	$ (24,091)	$ 172,617	$ 15,885	$ (19,292)	$ (193,301)
Beginning balance, Shares at Mar. 31, 2017		29,567,698
Issue of shares, net of issue costs, Amount	81,206	$ 81,206
Issue of shares, net of issue costs, Shares		15,914,683
Issue of shares upon exercise of incentive share options and vesting of RSU's, Amount	111	$ 111
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares		105,550
Issue of warrants	3,667		3,667
Net loss	(62,240)				(62,240)
Change in fair value of effective portion of foreign currency cash flow hedges	409			409
Unrealized gain on short-term investments	25			25
Foreign currency gain (loss) on:
Long-term investment nature intra- entity balances	(6,922)			(6,922)
Retranslation of foreign entities	8,066			8,066
Provision for pension benefit obligation	132			132
Other comprehensive income (loss), net	1,710			1,710
Stock-based compensation	3,458		3,458
Ending balance at Dec. 31, 2017	3,821	$ 253,934	23,010	(17,582)	(255,541)
Ending balance, Shares at Dec. 31, 2017		45,587,931
Beginning balance at Sep. 30, 2017	(16,378)	$ 217,883	18,357	(17,388)	(235,230)
Beginning balance, Shares at Sep. 30, 2017		37,694,531
Issue of shares, net of issue costs, Amount	36,047	$ 36,047
Issue of shares, net of issue costs, Shares		7,864,683
Issue of shares upon exercise of incentive share options and vesting of RSU's, Amount	4	$ 4
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares		28,717
Issue of warrants	3,667		3,667
Net loss	(20,311)				(20,311)
Change in fair value of effective portion of foreign currency cash flow hedges	(64)			(64)
Unrealized gain on short-term investments	(7)			(7)
Foreign currency gain (loss) on:
Long-term investment nature intra- entity balances	(2,133)			(2,133)
Retranslation of foreign entities	1,965			1,965
Provision for pension benefit obligation	45			45
Other comprehensive income (loss), net	(194)			(194)
Stock-based compensation	986		986
Ending balance at Dec. 31, 2017	3,821	$ 253,934	23,010	(17,582)	(255,541)
Ending balance, Shares at Dec. 31, 2017		45,587,931
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	45,646,424
Issue of shares, net of issue costs, Amount	$ 113,723	$ 113,723
Issue of shares, net of issue costs, Shares		19,085,068
Issue of shares upon exercise of incentive share options and vesting of RSU's, Amount	22	$ 22
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares		241,060
Net loss	(78,792)				(78,792)
Change in fair value of effective portion of foreign currency cash flow hedges	(320)			(320)
Unrealized gain on short-term investments	416			416
Foreign currency gain (loss) on:
Long-term investment nature intra- entity balances	10,848			10,848
Retranslation of foreign entities	(10,294)			(10,294)
Provision for pension benefit obligation	107			107
Other comprehensive income (loss), net	757			757
Stock-based compensation	3,576		3,576
Ending balance at Dec. 31, 2018	$ 24,655	$ 367,679	27,284	(15,877)	(354,431)
Ending balance, Shares at Dec. 31, 2018	64,972,552	64,972,552
Beginning balance at Sep. 30, 2018	$ (14,736)	$ 303,176	26,211	(15,946)	(328,177)
Beginning balance, Shares at Sep. 30, 2018		54,229,503
Issue of shares, net of issue costs, Amount	64,503	$ 64,503
Issue of shares, net of issue costs, Shares		10,615,385
Issue of shares upon exercise of incentive share options and vesting of RSU's, Shares		127,664
Net loss	(26,254)				(26,254)
Change in fair value of effective portion of foreign currency cash flow hedges	41			41
Unrealized gain on short-term investments	169			169
Foreign currency gain (loss) on:
Long-term investment nature intra- entity balances	3,399			3,399
Retranslation of foreign entities	(3,575)			(3,575)
Provision for pension benefit obligation	35			35
Other comprehensive income (loss), net	69			69
Stock-based compensation	1,073		1,073
Ending balance at Dec. 31, 2018	$ 24,655	$ 367,679	$ 27,284	$ (15,877)	$ (354,431)
Ending balance, Shares at Dec. 31, 2018	64,972,552	64,972,552