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Estimated Assumptions of Fair Value of MET Series A Preferred Shares Estimated Assumptions (Detail) (Mobile Embedded Technology Inc, Series A Preferred Stock)
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12 Months Ended | |
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Dec. 31, 2011
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Dec. 31, 2010
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Mobile Embedded Technology Inc | Series A Preferred Stock
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| Fair Value Measurements [Line Items] | ||
| Risk-free interest rates | 0.35% | 1.87% |
| Expected volatility | 52.36% | 61.71% |
| - IPO | 50.00% | |
| - Liquidation | 25.00% | 25.00% |
| - Redemption | 75.00% | 25.00% |