Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Stock Based Compensation (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jan. 31, 2017 |
Jan. 31, 2016 |
Jan. 31, 2017 |
Jan. 31, 2016 |
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| Expected volatility, minimum | 96.13% | 88.31% | 91.73% | 83.57% |
| Expected volatility, maximum | 124.47% | 88.37% | 124.47% | 89.70% |
| Risk-free interest rate, minimum | 1.24% | 1.58% | 0.82% | 0.86% |
| Risk-free interest rate, maximum | 2.52% | 2.01% | 2.54% | 2.01% |
| Expected forfeiture rate | 0.00% | 0.00% | 0.00% | 0.00% |
| Expected dividend yield | ||||
| Minimum [Member] | ||||
| Expected term | 2 years 11 months 1 day | 5 years | 2 years 7 months 2 days | 2 years 7 months 6 days |
| Maximum [Member] | ||||
| Expected term | 10 years | 6 years 6 months | 10 years | 6 years 6 months |
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- Definition The estimated forfeiture rate of the underlying shares over the option's term. No definition available.
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- Definition The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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. No definition available.
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- 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. No definition available.
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. No definition available.
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. No definition available.
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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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