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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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