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Stockholder's Equity - Range of Expected Volatilities for Options (Detail) (Service-Based Vesting Condition Options [Member]) | 6 Months Ended
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May 31, 2013
Service-Based Vesting Condition Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Minimum expected volatility | 111.60%
Maximum expected volatility | 114.90%

X
- Definition The estimated measure of the maximum 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. + References No definition available. + Details
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X
- Definition The estimated measure of the minimum 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. + References No definition available. + Details
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