Fair Value Measurements - Schedule of assets and liabilities measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Liabilities
Warrant liabilities	$ 558	$ 3,555
Recurring | Private Placement Warrants
Liabilities
Warrant liabilities	558	3,555
Recurring | Money market funds
Assets
Cash, cash equivalents, and restricted cash:	283,977	458,676
Recurring | International treasuries
Assets
Cash, cash equivalents, and restricted cash:	7,569	3,777
Recurring | Level 1 | Private Placement Warrants
Liabilities
Warrant liabilities	0	0
Recurring | Level 1 | Money market funds
Assets
Cash, cash equivalents, and restricted cash:	283,977	458,676
Recurring | Level 1 | International treasuries
Assets
Cash, cash equivalents, and restricted cash:	0	0
Recurring | Level 2 | Private Placement Warrants
Liabilities
Warrant liabilities	0	0
Recurring | Level 2 | Money market funds
Assets
Cash, cash equivalents, and restricted cash:	0	0
Recurring | Level 2 | International treasuries
Assets
Cash, cash equivalents, and restricted cash:	7,569	3,777
Recurring | Level 3 | Private Placement Warrants
Liabilities
Warrant liabilities	558	3,555
Recurring | Level 3 | Money market funds
Assets
Cash, cash equivalents, and restricted cash:	0	0
Recurring | Level 3 | International treasuries
Assets
Cash, cash equivalents, and restricted cash:	$ 0	$ 0