Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 753	$ 780
Less: Accumulated depreciation	(35)	(58)
Property and equipment, net	718	722
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	689	689
Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5	5
Computers & equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9	36
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 50	$ 50