Income taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 255,442	$ 147,789
Tax credits	507	11,461
Lease liability	14,033	6,793
Capitalized research and development costs	111,985	82,084
Other	18,274	7,042
Total deferred tax assets	400,241	255,169
Deferred tax liabilities:
ROU asset	(16,196)	(6,902)
Other	0	0
Total deferred tax liabilities	(16,196)	(6,902)
Valuation allowance	(384,037)	(248,230)	$ (108,794)	$ (14,562)
Net deferred tax asset	$ 8	$ 37