CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Total revenue	$ 8,169	$ 7,883
Cost of revenue	(4,563)	(4,065)
Gross profit	3,606	3,818
Operating expenses:
Sales and marketing	(2,580)	(2,281)
Research and development, net of government grants	(11,653)	(12,570)
General and administrative expense:
Compensation expense in respect of share options and management equity incentives	(1,178)	(1,347)
Other general and administrative expenses	(6,619)	(6,158)
Total general and administrative expense	(7,797)	(7,505)
Total operating expense	(22,030)	(22,356)
Operating loss	(18,424)	(18,538)
Other income (expense):
Interest expense, net	(6,086)	(3,116)
Other, net	952	(3,512)
Other expense, net	(5,134)	(6,628)
Loss before income taxes	(23,558)	(25,166)
Provision for income taxes	(13)	(11)
Net loss	(23,571)	(25,177)
Other comprehensive income (loss):
Change in fair value of foreign currency cash flow hedges	(120)	(332)
Change in unrealized gain on short-term investments	147	26
Foreign currency gain (loss)	(1,014)	357
Provision for pension benefit obligation	48	36
Other comprehensive income (loss), net	(939)	87
Comprehensive loss	(24,510)	(25,090)
Net loss available to ordinary shareholders - basic and diluted	$ (23,571)	$ (25,177)
Loss per share - basic and diluted	$ (0.36)	$ (0.55)
Weighted-average shares outstanding - basic and diluted	66,078,290	45,796,533
Product Sales [Member]
Revenue:
Total revenue	$ 8,169	$ 7,864
Other Revenues [Member]
Revenue:
Total revenue		$ 19