Summary of significant accounting policies - Estimate fair value (Details) |
9 Months Ended |
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May 31, 2020
$ / shares
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| Risk free rate | 0.47% |
| Volatility | 134.00% |
| March 2019 Conversion Feature [Member] | |
| Market price per share | $ 6.68 |
| March 2019 Warrant Liability [Member] | |
| Risk free rate | 1.60% |
| Market price per share | $ 6.68 |
| Life of instrument in years | 4 years |
| Volatility | 102.00% |
| Minimum | March 2019 Conversion Feature [Member] | |
| Risk free rate | 0.08% |
| Life of instrument in years | 5 months 19 days |
| Volatility | 117.00% |
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- Definition This represents Market price per share. No definition available.
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. No definition available.
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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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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