Revenue recognition - Customers and service and other revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue recognition
Service type warranties term	1 year
Revenue	$ 29,552	$ 27,209
Service and other revenue
Revenue recognition
Revenue	8,810	$ 6,409
Collaboration agreement | Service and other revenue
Revenue recognition
Revenue	2,700
Collaboration agreement | Eli Lilly
Revenue recognition
Transaction price due	10,900
Master collaboration agreement | Eli Lilly
Revenue recognition
Non-refundable up-front payment received	5,000
Statement of works agreement | Eli Lilly
Revenue recognition
Collaborative arrangement payment received per quarter	$ 1,500
Minimum
Revenue recognition
Period of payment	30 days
Maximum
Revenue recognition
Period of payment	45 days