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.

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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.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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Stock warrants (Details 2)	3 Months Ended	6 Months Ended	12 Months Ended
Stock warrants (Details 2)	Sep. 30, 2018	Dec. 31, 2018	Jun. 30, 2018
Risk Free Interest Rate [Member]
Risk-free interest rate		2.56%	2.06%
Expected Volatility [Member]
Expected volatility		154.00%	151.00%
Expected Life [Member]
Expected life (years)		6 months	6 months
Derivative [Member] \| Annual Dividend Yield [Member]
Annual Dividend Yield
Stock Warrant [Member] \| Annual Dividend Yield [Member]
Annual Dividend Yield
Stock Warrant [Member] \| Risk Free Interest Rate [Member]
Risk-free interest rate		2.45%	20.60%
Stock Warrant [Member] \| Expected Volatility [Member]
Expected volatility		138.00%	151.00%
Stock Warrant [Member] \| Expected Life [Member]
Expected life (years)		6 months	6 months