CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Total revenue	$ 43,379	$ 32,656	$ 29,134
Cost of revenue	(20,074)	(17,800)	(17,230)
Gross profit	23,305	14,856	11,904
Operating expenses:
Sales and marketing	(9,849)	(9,853)	(8,637)
Research and development, net of government grants	(54,168)	(53,744)	(50,677)
General and administrative expense:
Compensation expense in respect of share options and management equity incentives	(4,984)	(4,467)	(4,957)
Other general and administrative expenses	(36,812)	(27,483)	(26,588)
Total general and administrative expense	(41,796)	(31,950)	(31,545)
Total operating expense	(105,813)	(95,547)	(90,859)
Operating loss	(82,508)	(80,691)	(78,955)
Other income (expense):
Interest expense, net	(25,918)	(23,859)	(20,018)
Other, net	1,882	2,438	(6,369)
Other income (expense), net	(24,036)	(21,421)	(26,387)
Loss before income taxes	(106,544)	(102,112)	(105,342)
Provision for income taxes	(1,926)	(661)	(44)
Net loss	(108,470)	(102,773)	(105,386)
Other comprehensive income (loss):
Change in fair value of effective portion of foreign currency cash flow hedges	582	(157)	(123)
Unrealized gain (loss) on short-term investments	(898)	554	796
Foreign currency gain (loss)	(1,216)	(2,702)	1,964
Provision for pension benefit obligation	622	2,034	(887)
Other comprehensive loss, net	(910)	(271)	1,750
Comprehensive loss	(109,380)	(103,044)	(103,636)
Net loss available to ordinary shareholders - basic and diluted	$ (108,470)	$ (102,773)	$ (105,386)
Loss per share - basic and diluted	$ (1.18)	$ (1.44)	$ (1.92)
Weighted-average shares outstanding - basic and diluted	91,637,966	71,610,035	54,874,391
Product Sales [Member]
Revenue:
Total revenue	$ 35,787	$ 31,601	$ 28,665
Other Revenues [Member]
Revenue:
Total revenue	$ 7,592	$ 1,055	$ 469