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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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