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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 6,632	$ 5,922
Less accumulated depreciation	(3,934)	(3,545)
Property and equipment, net	2,698	2,377
Computers and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	607	596
Furniture, Fixtures, and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	400	400
Manufacturing and Testing Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,693	3,874
Construction in Process
Property Plant And Equipment [Line Items]
Property and equipment, gross	0	120
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 932	$ 932

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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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