Balance Sheet Components - Components of Property and Equipment - Net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,708	$ 2,889
Less: accumulated depreciation	(2,299)	(2,367)
Total property and equipment, net	409	522
Machinery, Computer Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,576	2,759
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	94	94
Furniture
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 38	$ 36

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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