Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Property, Plant, and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,964	$ 1,964
Less accumulated depreciation and amortization	(1,925)	(1,908)
Net property and equipment	39	56
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