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Nature of the business (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net loss	$ (43,102)	$ (42,253)	$ (29,355)	$ (27,311)	$ (85,355)	$ (56,666)
Accumulated deficit	$ (396,559)				$ (396,559)		$ (311,204)

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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