Share-based payments (Details 2)	6 Months Ended
Jun. 30, 2019 USD ($)
Dividend yield
Minimum [Member]
Risk-free interest rate	1.90%
Expected life (years)	4 months 24 days
Volatility	114.10%
Maximum [Member]
Risk-free interest rate	2.60%
Expected life (years)	1 year
Volatility	143.00%
Fair Value Of Fully-Vested Common Stock Warrants [Member]
Risk-free interest rate	2.40%
Expected life (years)	5 years
Dividend yield
Fair Value Of Fully-Vested Common Stock Warrants [Member] \| Minimum [Member]
Volatility	133.50%
Fair Value Of Fully-Vested Common Stock Warrants [Member] \| Maximum [Member]
Volatility	133.70%

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.

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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.

+ References

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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 award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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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-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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