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Summary of significant accounting policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary of significant accounting policies
Cash equivalents	$ 150,734	$ 36,712
Restricted cash	1,636	1,636
Research and Development Incentives Income	2,807	3,084
Research and Development Incentives Receivable, Current	2,953	2,962
Foreign currency translation gain (loss)	866	(236)
Unrealized loss on short-term investments, net of tax	$ (278)	309
Minimum percentage of benefit recognized is being realized upon ultimate settlement	50.00%
Office equipment
Summary of significant accounting policies
Property, Plant and Equipment, Useful Life	5 years
Computer equipment
Summary of significant accounting policies
Property, Plant and Equipment, Useful Life	3 years
Plant, plant and laboratory equipment
Summary of significant accounting policies
Property, Plant and Equipment, Useful Life	5 years
Leasehold improvements
Summary of significant accounting policies
Property, Plant and Equipment, Useful Life	10 years
United Kingdom | Maximum
Summary of significant accounting policies
Percentage of qualifying research and development expenses reimbursed by government	14.50%
Operating Lease [Member]
Summary of significant accounting policies
Restricted cash	$ 1,636	$ 1,636

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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