Balance Sheet Details - Schedule of Other Current Assets and Prepaid Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid clinical and related costs	$ 1,201	$ 2,064
VAT receivable	410	333
Research grant	0	3,789
Prepaid insurance	671	369
Other	842	831
Other current assets and prepaid expenses	$ 3,124	$ 7,386