Black-Scholes-Merton Option Pricing Model for Employee and Director Stock Options Granted (Detail) (USD $)
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9 Months Ended | |
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Sep. 30, 2014
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Sep. 30, 2013
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Share Based Payment Award Stock Options Valuation Assumptions [Line Items] | ||
Expected dividend yield | 0.00% | 0.00% |
Weighted average expected volatility | 64.00% | 63.00% |
Weighted average expected term (years) | 5 years 10 months 2 days | 6 years 11 days |
Weighted average risk-free rate | 1.76% | 1.28% |
Weighted average fair value per share | $ 7.14 | $ 3.98 |
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Expected term of share-based compensation awards, 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
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average expected volatility rate of share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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