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Financial Statement Details - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 35,129	$ 33,424
Less—accumulated depreciation and amortization	(28,138)	(25,032)
Property, plant and equipment, net	6,991	8,392
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	288	260
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,614	2,363
Test equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,396	23,115
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,548	4,373
Product tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	449	409
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	564	915
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,003	1,746
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 267	$ 243

X

- Definition

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

+ References

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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.

+ References

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