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Income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Taxes
Income tax benefit	$ 0	$ 0
Net loss before income taxes
United States	(22,775)	(12,963)
Foreign (United Kingdom)	(58,095)	(39,662)
Net loss before income taxes	$ (80,870)	$ (52,625)

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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