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Nature of the business and basis of presentation - Going Concern (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Nature of the business and basis of presentation
Net loss	$ (24,987)	$ (11,831)	$ (22,101)	$ (8,465)	$ (9,267)	$ (8,007)	$ (58,919)	$ (25,739)
Accumulated deficit	$ (300,507)						$ (300,507)		$ (241,588)

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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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