Balance Sheet Components - Property and equipment, net (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Property, Plant, and Equipment [Line Items]
Total property and equipment excluding construction-in-progress	$ 6,284	$ 6,245
Less accumulated depreciation and amortization	(5,853)	(5,540)
Property and equipment excluding construction-in-progress, net	431	705
Construction-in-progress	94	31
Property, Plant and Equipment, Net, Total	525	736
Laboratory equipment
Property, Plant, and Equipment [Line Items]
Total property and equipment excluding construction-in-progress	4,298	4,259
Leasehold improvements
Property, Plant, and Equipment [Line Items]
Total property and equipment excluding construction-in-progress	1,655	1,655
Office equipment
Property, Plant, and Equipment [Line Items]
Total property and equipment excluding construction-in-progress	227	227
Software
Property, Plant, and Equipment [Line Items]
Total property and equipment excluding construction-in-progress	$ 104	$ 104

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Amount of accumulated depreciation, depletion, and amortization of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

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