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Common Stock - Summary of Fair Value of Warrants Issued (Detail) (Stock warrants [Member])
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Stock warrants [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Risk-free interest rates | 0.33% | 0.34% | 0.55% |
| Expected dividend yield | 0.00% | 0.00% | 0.00% |
| Expected life | 1 year 9 months 18 days | 2 years 9 months 18 days | 3 years 9 months 18 days |
| Expected volatility | 39.00% | 45.00% | 76.00% |
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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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- 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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- 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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- Definition
Risk-free interest rate assumption used in valuing an instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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