Collaboration agreements - GlaxoSmithKline (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2022 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 06, 2022 performanceObligation
Collaboration agreements
Collaboration revenue		$ 2,293	$ 10,654	$ 11,538	$ 18,456
Deferred revenue		116,916	134,697	116,916	134,697	$ 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	$ 600	0	$ 1,300
Deferred revenue		$ 94,500		$ 94,500		$ 94,600