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Financial Statement Details - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 33,424	$ 71,644
Less—accumulated depreciation and amortization	(25,032)	(62,832)
Property, plant and equipment, net	8,392	8,812
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	260	229
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,363	2,084
Test equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,115	47,243
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,373	11,399
Product tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	409	3,832
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	915	2,151
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,746	1,042
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 243	$ 3,664

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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