CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Product sales	$ 5,910	$ 4,844	$ 12,136	$ 10,561
Other revenues		1,300	600	1,300
Total revenue	5,910	6,144	12,736	11,861
Cost of revenue	(2,786)	(2,761)	(5,618)	(5,852)
Gross profit	3,124	3,383	7,118	6,009
Operating expenses:
Sales and marketing	(1,869)	(1,273)	(3,551)	(2,530)
Research and development, net of government grants	(13,341)	(14,495)	(26,014)	(26,296)
General and administrative expense:
Compensation expense in respect of share options and management equity incentives	(1,187)	(1,083)	(2,472)	(1,981)
Other general and administrative expenses	(4,787)	(4,043)	(10,047)	(9,091)
Total general and administrative expense	(5,974)	(5,126)	(12,519)	(11,072)
Total operating expense	(21,184)	(20,894)	(42,084)	(39,898)
Operating loss	(18,060)	(17,511)	(34,966)	(33,889)
Other income (expense):
Interest expense, net	(4,197)	(1,213)	(8,407)	(2,384)
Other, net	565	1,366	1,444	2,680
Other income (expense), net	(3,632)	153	(6,963)	296
Loss before income taxes	(21,692)	(17,358)	(41,929)	(33,593)
Net loss	(21,692)	(17,358)	(41,929)	(33,593)
Other comprehensive income (loss):
Change in fair value of effective portion of foreign currency cash flow hedges	128	29	473	(234)
Change in unrealized gain on short-term investments	(6)		32
Foreign currency gain (loss)	(504)	(594)	1,312	(3,903)
Provision for pension benefit obligation	44	46	87	87
Other comprehensive income (loss), net	(338)	(519)	1,904	(4,050)
Comprehensive loss	(22,030)	(17,877)	(40,025)	(37,643)
Net loss available to ordinary shareholders - basic and diluted	$ (21,692)	$ (17,358)	$ (41,929)	$ (33,593)
Loss per share - basic and diluted	$ (0.58)	$ (0.62)	$ (1.13)	$ (1.25)
Weighted-average shares outstanding - basic and diluted	37,657,409	28,123,334	37,223,957	26,774,378