Collaboration agreements - GlaxoSmithKline (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Aug. 31, 2022 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 06, 2022 performanceObligation
Collaboration agreements
Collaboration revenue		$ 9,245	$ 7,802
Deferred revenue		117,640	144,351	$ 125,314	$ 147,653
GSK Agreement
Collaboration agreements
Upfront payment received	$ 100,000
Collaboration arrangement, potential option exercise receivable	$ 90,000
Performance obligations identified | performanceObligation						2
Collaboration revenue		0	$ 700
Deferred revenue		$ 94,800		$ 94,600