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Income taxes (Tables)

12 Months Ended

Mar. 31, 2021

Income taxes

Schedule of net loss before income taxes

		Year Ended March 31,
		2021			2020
United States			(22,775)			(12,963)
Foreign (United Kingdom)			(58,095)			(39,662)
Total			(80,870)			(52,625)

Schedule of reconciliation of the U.S federal statutory income tax rate

		Year Ended March 31,
		2021		2020
U.S. Federal statutory income tax rate		(21.0)	%	(21.0)	%
State taxes, net of federal benefit		(2.4)	%	(1.6)	%
Research and development credits		(0.8)	%	0	%
Research and development expenses		1.9	%	2.2	%
Return to provision		0	%	1.9	%
Stock compensation		(3.9)	%	0	%
Foreign tax rate differential		0.0	%	2.8	%
Change in valuation allowance		25.9	%	16.0	%
Other		0.3	%	(0.3)	%
		0.0	%	0.00	%

Schedule of components of deferred tax assets and liabilities

		Year Ended March 31,
		2021			2020
Deferred tax assets
Federal net operating loss carryforwards			7,083			2,450
Foreign net operating loss carryforwards			22,195			9,092
State net operating loss carryforwards			2,358			1,054
Research & development credits			787			—
Property, plant and equipment			5,068			5,499
Capitalized start-up costs			1,597			1,748
Stock compensation			4,838			2,526
Accrued expense			739			341
Lease liability			8,462			8,705
Total deferred tax assets			53,127			31,415
Deferred tax liabilities
Right of Use Asset			(13,090)			(13,998)
Other			(9)			(88)
Total deferred tax liabilities			(13,099)			(14,086)
Valuation Allowance			(40,028)			(17,329)
Net deferred tax assets			—			—

Schedule of changes in the valuation allowance for deferred tax assets

		Year Ended March 31,
		2021			2020
Valuation allowance as of beginning of year		$	17,329		$	9,396
Increases recorded to income tax provision			22,624		$	8,047
Increases recorded to income tax provision for equity		$	76		$	—
Decreases recorded to income tax provision for equity		$	—		$	(114)
Valuation allowance as of end of year			40,028		$	17,329

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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-Name Accounting Standards Codification
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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance.

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