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Stockholders' Equity (Detail) - Assumptions Used in Calculating Fair Value of Warrants Issued
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1 Months Ended | 12 Months Ended | 9 Months Ended | 2 Months Ended | 9 Months Ended | 12 Months Ended | ||
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Oct. 31, 2009
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Dec. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2012
Warrant [Member]
Minimum [Member]
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Sep. 30, 2012
Warrant [Member]
Maximum [Member]
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Feb. 27, 2012
Warrant [Member]
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Sep. 30, 2012
Warrant [Member]
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Dec. 31, 2011
Maximum [Member]
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| Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | |||
| Expected Volatility | 38.28% | 46.58% | 44.84% | 41.30% | 49.00% | 49.00% | ||
| Risk free Interest rates | 1.14% | 0.25% | 0.61% | 0.19% | 0.93% | 0.93% | 0.45% | |
| Expected lives (years) | 2 years | 54 days | 9 months | 1 year 255 days | 5 years | 5 years | ||
| X | ||||||||||
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- Definition
Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Risk-free interest rate assumption used in valuing an instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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