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Condensed Consolidated Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Property and Equipment, Net [Line Items]    
Property and equipment, gross $ 4,916 $ 4,916
Less: accumulated depreciation and amortization (4,835) (4,814)
Property and equipment, net 81 102
Leasehold improvements [Member]    
Schedule of Property and Equipment, Net [Line Items]    
Property and equipment, gross 2,711 2,711
Lab equipment [Member]    
Schedule of Property and Equipment, Net [Line Items]    
Property and equipment, gross 1,513 1,513
Office furniture & fixtures [Member]    
Schedule of Property and Equipment, Net [Line Items]    
Property and equipment, gross 522 522
Computer equipment [Member]    
Schedule of Property and Equipment, Net [Line Items]    
Property and equipment, gross $ 170 $ 170