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Financial Statement Details - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 71,644	$ 73,728
Less—accumulated depreciation and amortization	(62,832)	(68,449)
Property, plant and equipment, net	8,812	5,279
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	229	0
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,084	0
Test equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	47,243	53,019
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,399	11,247
Product tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,832	3,535
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,151	1,824
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,042	0
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,664	$ 4,103

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC
-Name Regulation S-X (SX)
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-Section 02
-Paragraph 13
-Subparagraph a
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