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Other Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Variable Interest Entity [Line Items]
Ownership interest in investment	27.00%	27.00%
Purchase of components under agreement	$ 1,959,000	$ 2,087,000	$ 5,577,000
Company owed GWS	152,000	281,000
Allocation of equity method income (loss)	0	0	0
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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