Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Payables and Accruals [Abstract]
Accrued research and development expenses	$ 3,594	$ 659
Accrued compensation expense	1,025	591
Accrued professional and legal costs	418	308
Accrued transaction expenses		567
Accrued patent reimbursement costs		48
Other accrued expenses and other current liabilities	158	22
Total accrued expenses and other current liabilities	$ 5,195	$ 2,195