Estimated Fair Value of Warrants is Determined using Black-Scholes Option Valuation Model (Detail) - $ / shares |
12 Months Ended | ||
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Feb. 06, 2015 |
Sep. 26, 2014 |
May 31, 2018 |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |||
| Expected dividend yield | 0.00% | 0.00% | 0.00% |
| Stock price volatility | 119.00% | 136.00% | 61.48% |
| Expected term | 5 years | 5 years | 1 month |
| Risk-free interest rate | 1.48% | 1.82% | 0.84% |
| Grant-date fair value | $ 0.25 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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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://fasb.org/us-gaap/role/ref/legacyRef
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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://fasb.org/us-gaap/role/ref/legacyRef
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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://fasb.org/us-gaap/role/ref/legacyRef
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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://fasb.org/us-gaap/role/ref/legacyRef
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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://fasb.org/us-gaap/role/ref/legacyRef
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