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Stock-Based Compensation - Additional Information (Detail) - 2007 VI Chip Plan [Member] - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified stock options			2,984,250
Stock-based compensation expense reversed	$ (768,000)
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in costs and expenses due to reversal of share-based compensation expense	86,000	$ 86,000
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in costs and expenses due to reversal of share-based compensation expense	516,000	516,000
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in costs and expenses due to reversal of share-based compensation expense	$ 166,000	$ 166,000

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- Definition

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+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Allocated share based compensation expenses reversed.

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