Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,964	$ 1,964
Less accumulated depreciation and amortization	(1,903)	(1,816)
Net property and equipment	61	148
Office equipment and computers
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,777	1,777
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	54	54
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 133	$ 133