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Balance Sheet Components - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,504	$ 2,012
Less: Accumulated depreciation	(1,084)	(743)
Property and equipment, net	1,420	1,269
Tools and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,720	1,523
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	108	118
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	254	43
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	29	30
Construction In Process
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 393	$ 298

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- Definition

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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