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Nature of the business (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Nature of the business
Net losses	$ 21,499	$ 21,783	$ 20,095	$ 17,493	$ 15,789	$ 16,189	$ 11,139	$ 9,508	$ 80,870	$ 52,625
Accumulated deficit	$ (193,168)				$ (112,298)				$ (193,168)	$ (112,298)

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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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