Share-based payments (Details 1)	6 Months Ended
Jun. 30, 2019 USD ($) $ / shares shares
Number of Warrants
Outstanding, Beginning \| shares	14,467,717
Granted \| shares	4,400,000
Forfeited or expired \| shares
Outstanding, Ending \| shares	18,867,717
Exercisable, Ending \| shares	18,867,717
Weighted Average Exercise Price
Outstanding, Beginning \| $ / shares	$ 0.05
Granted \| $ / shares	0.05
Forfeited or expired \| $ / shares
Outstanding, Ending \| $ / shares	0.05
Exercisable, Ending \| $ / shares	$ 0.05
Weighted-average Remaining Life (Years)
Outstanding, Ending	4 years 2 months 12 days
Outstanding, Beginning	4 years 7 months 6 days
Nonemployee common stock warrants -- Fully-vested upon issuance [Member]
Number of Warrants
Outstanding, Beginning \| shares	13,445,836
Granted \| shares	1,300,000
Forfeited or expired \| shares	(5,510,000)
Outstanding, Ending \| shares	9,235,836
Exercisable, Ending \| shares	9,235,836
Weighted Average Exercise Price
Outstanding, Beginning \| $ / shares	$ 0.27
Granted \| $ / shares	0.05
Forfeited or expired \| $ / shares	0.51
Outstanding, Ending \| $ / shares	0.10
Exercisable, Ending \| $ / shares	$ 0.10
Weighted-average Remaining Life (Years)
Outstanding, Ending	1 year 4 months 24 days
Outstanding, Beginning	1 year 8 months 12 days
Exercisable, ending	1 year 8 months 12 days
Aggregate Intrinsic Value
Outstanding, beginning \| $	$ 78,000
Outstanding, Ending \| $	194,500
Exercisable, ending \| $	$ 194,500

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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