CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Total revenue	$ 7,941	$ 6,723	$ 23,956	$ 20,853
Cost of revenue	(4,532)	(4,186)	(13,067)	(12,803)
Gross profit	3,409	2,537	10,889	8,050
Operating expenses:
Sales and marketing	(2,290)	(2,233)	(7,123)	(6,359)
Research and development, net of government grants	(14,160)	(11,788)	(38,895)	(37,356)
General and administrative expense:
Compensation expense in respect of share options and management equity incentives	(1,196)	(1,073)	(3,375)	(3,576)
Other general and administrative expenses	(8,120)	(6,471)	(20,717)	(19,388)
Total general and administrative expense	(9,316)	(7,544)	(24,092)	(22,964)
Total operating expense	(25,766)	(21,565)	(70,110)	(66,679)
Operating loss	(22,357)	(19,028)	(59,221)	(58,629)
Other income (expense):
Interest expense, net	(7,008)	(5,679)	(20,384)	(14,614)
Other, net	1,894	(1,536)	1,600	(5,516)
Other expense, net	(5,114)	(7,215)	(18,784)	(20,130)
Loss before income taxes	(27,471)	(26,243)	(78,005)	(78,759)
Provision for income taxes	(14)	(11)	(41)	(33)
Net loss	(27,485)	(26,254)	(78,046)	(78,792)
Other comprehensive income (loss):
Change in fair value of foreign currency cash flow hedges	487	41	209	(320)
Change in unrealized gain on short-term investments	148	169	342	416
Foreign currency gain (loss)	254	(176)	(771)	554
Provision for pension benefit obligation	48	35	144	107
Other comprehensive income (loss), net	937	69	(76)	757
Comprehensive loss	(26,548)	(26,185)	(78,122)	(78,035)
Net loss available to ordinary shareholders - basic and diluted	$ (27,485)	$ (26,254)	$ (78,046)	$ (78,792)
Loss per share - basic and diluted	$ (0.37)	$ (0.46)	$ (1.14)	$ (1.53)
Weighted-average shares outstanding - basic and diluted	73,768,845	56,619,356	68,722,475	51,512,352
Product Sales [Member]
Revenue:
Total revenue	$ 7,636	$ 6,723	$ 22,901	$ 20,834
Other Revenues [Member]
Revenue:
Total revenue	$ 305		$ 1,055	$ 19