Balance Sheet Components - Property and Equipment Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Property and Equipment, Net
Total property and equipment, gross	$ 19,814	$ 16,176
Less: accumulated depreciation	(15,931)	(15,203)
Total property and equipment, net	3,883	973
Depreciation and amortization expense	1,000	1,500
Manufacturing equipment
Property and Equipment, Net
Total property and equipment, gross	16,130	12,608
Computer and network equipment
Property and Equipment, Net
Total property and equipment, gross	1,124	1,008
Furniture and fixtures
Property and Equipment, Net
Total property and equipment, gross	187	187
Software
Property and Equipment, Net
Total property and equipment, gross	929	929
Leasehold improvements
Property and Equipment, Net
Total property and equipment, gross	$ 1,444	$ 1,444

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of expense for allocation of cost of tangible and intangible assets over their useful lives directly used in production of good and rendering of service.

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