Commitments and Contingencies - Maturities of operating lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Maturities of operating lease liabilities:
Remainder of 2024	$ 211
2025	642
Total lease payments	853
Less: imputed interest	(49)
Total lease liabilities	804	$ 1,400
Current operating lease liabilities	$ 804
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Accrued Liabilities, Noncurrent	Other Accrued Liabilities, Noncurrent