Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accrued Expense and Other Current Liabilities
Accrued employee compensation and benefits	$ 10,845	$ 837
Accrued clinical trial costs	36,446	29,501
Operating lease liabilities - current portion	3,550	3,308
Other accrued expenses and other current liabilities	6,887	6,200
Accrued expenses and other current liabilities	$ 57,728	$ 39,846