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Other Investments - Additional Information (Detail) (USD $) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 Agreement | Jun. 30, 2013 | Dec. 31, 2013
Variable Interest Entity [Line Items] |  |  |
Ownership interest in investment | 27.00% |  | 27.00%
Number of supply agreements with GWS | 2 |  |
Purchase of components under agreement | $ 1,496,000 | $ 433,000 |
Company owed GWS | 166,000 |  | 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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