Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Less: accumulated amortization and depreciation	$ (530)	$ (507)
Property and equipment, net	234	234
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment	35	36
Computer Software
Property Plant And Equipment [Line Items]
Property and equipment	29	30
Lab Equipment
Property Plant And Equipment [Line Items]
Property and equipment	476	486
Leasehold Improvement
Property Plant And Equipment [Line Items]
Property and equipment	35	36
Office Furniture
Property Plant And Equipment [Line Items]
Property and equipment	$ 189	$ 153