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Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 35,414	$ 26,773
Less—accumulated depreciation and amortization	(21,715)	(16,017)
Property, plant and equipment, net	13,699	10,756
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	244	253
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,213	2,303
Test equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,775	10,952
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,899	6,911
Product tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,125	2,139
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,310	1,535
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,988	2,535
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 860	$ 145

X

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

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