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Stock Options (Details) (Service-based vesting condition options [Member])
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3 Months Ended | 9 Months Ended | ||
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Aug. 31, 2012
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Aug. 31, 2011
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Aug. 31, 2012
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Aug. 31, 2011
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Service-based vesting condition options [Member]
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| Weighted average values: | ||||
| Expected dividends | 0.00% | 0.00% | 0.00% | 0.00% |
| Expected volatility | 115.76% | 108.85% | 112.50% | 107.62% |
| Risk free interest rate | 0.74% | 1.02% | 0.90% | 1.21% |
| Expected life | 5 years | 5 years 8 months 12 days | 5 years 7 months 6 days | 5 years 7 months 6 days |
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- Details
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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 estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. 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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