Supplemental information - Schedule of Revenues by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	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, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 133,213	$ 133,606	$ 133,517	$ 134,695	$ 143,953	$ 132,660	$ 115,925	$ 101,828	$ 99,234	$ 92,062	$ 86,713	$ 73,309	$ 535,031	$ 494,366	$ 351,318
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues													353,110	340,782	232,805
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues													93,939	93,264	86,564
Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues													30,577	18,654	8,782
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues													34,640	29,076	17,912
Greater China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues													$ 22,765	$ 12,590	$ 5,255