CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue:
Total revenue	$ 16,066	$ 7,846	$ 24,990	$ 16,015
Cost of revenue	(4,499)	(3,970)	(9,913)	(8,534)
Gross profit	11,567	3,876	15,077	7,481
Operating expenses:
Sales and marketing	(2,231)	(2,253)	(4,474)	(4,833)
Research and development, net of government grants	(12,878)	(13,083)	(24,328)	(24,736)
General and administrative expense:
Compensation expense in respect of share options and management equity incentives	(1,324)	(1,001)	(2,284)	(2,179)
Other general and administrative expenses	(8,232)	(5,980)	(16,810)	(12,597)
Total general and administrative expense	(9,556)	(6,981)	(19,094)	(14,776)
Total operating expense	(24,665)	(22,317)	(47,896)	(44,345)
Operating loss	(13,098)	(18,441)	(32,819)	(36,864)
Other income (expense):
Interest expense, net	(6,858)	(7,291)	(12,784)	(13,376)
Other, net	4,998	(1,244)	5,231	(294)
Other expense, net	(1,860)	(8,535)	(7,553)	(13,670)
Loss before income taxes	(14,958)	(26,976)	(40,372)	(50,534)
Provision for income taxes	(17)	(14)	(32)	(27)
Net loss	(14,975)	(26,990)	(40,404)	(50,561)
Other comprehensive income (loss):
Change in fair value of foreign currency cash flow hedges	279	(158)	276	(278)
Change in unrealized gain on short-term investments	(79)	47	(483)	194
Foreign currency gain (loss)	(3,447)	(11)	(3,301)	(1,025)
Provision for pension benefit obligation	14	48	27	96
Other comprehensive loss, net	(3,233)	(74)	(3,481)	(1,013)
Comprehensive loss	(18,208)	(27,064)	(43,885)	(51,574)
Net loss available to ordinary shareholders - basic and diluted	$ (14,975)	$ (26,990)	$ (40,404)	$ (50,561)
Loss per share - basic and diluted	$ (0.18)	$ (0.41)	$ (0.49)	$ (0.76)
Weighted-average shares outstanding - basic and diluted	83,949,195	66,291,548	82,227,052	66,185,501
Product Sales [Member]
Revenue:
Total revenue	$ 8,543	$ 7,096	$ 17,467	$ 15,265
Other Revenues [Member]
Revenue:
Total revenue	$ 7,523	$ 750	$ 7,523	$ 750