Intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Cost	$ 38,600	$ 30,100
Accumulated amortization	(28,708)	(24,456)
Net	9,892	5,644
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	30,100	30,100
Accumulated amortization	(28,218)	(24,456)
Net	1,882	5,644
In-licensed rights
Finite-Lived Intangible Assets [Line Items]
Cost	8,500	0
Accumulated amortization	(490)	0
Net	$ 8,010	$ 0