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Other Investments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Variable Interest Entity [Line Items]
Ownership interest in investment	27.00%		27.00%
Purchase of components under agreement	$ 942,000	$ 396,000
Company owed GWS	56,000		152,000
Great Wall Semiconductor Corporation (GWS) [Member]
Variable Interest Entity [Line Items]
Investment in non-voting convertible preferred stock	0		0
Great Wall Semiconductor Corporation (GWS) [Member] | Convertible Preferred Stock [Member]
Variable Interest Entity [Line Items]
Investment in non-voting convertible preferred stock	$ 5,000,000		$ 5,000,000

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Carrying amount as of the balance sheet date of obligations due all related parties.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount of purchases between the reporting entity and the Variable Interest Entity (VIE).

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