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Other Investments - Additional Information (Detail)	6 Months Ended
Other Investments - Additional Information (Detail)	Jun. 30, 2015 USD ($) Agreement	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Variable Interest Entity [Line Items]
Ownership interest in investment	27.00%		27.00%
Number of supply agreements with GWS \| Agreement	2
Purchase of components under agreement	$ 1,672,000	$ 1,496,000
GWS [Member]
Variable Interest Entity [Line Items]
Company owed GWS	113,000		$ 170,000
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]
Gross investment in non-voting convertible preferred stock	$ 5,000,000		$ 5,000,000