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Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 34,794	$ 35,414
Less—accumulated depreciation and amortization	(26,692)	(21,715)
Property, plant and equipment, net	8,102	13,699
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	0	244
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	0	2,213
Test equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,095	16,775
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,618	7,899
Product tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,350	3,125
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,214	1,310
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,654	2,988
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 863	$ 860

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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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