8. Share-based payments (Details 5) - Nonemployee Common stock warrants - Service and performance conditions [Member] - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Number of Warrants
Outstanding, Beginning	3,000,000
Granted		3,000,000
Outstanding, Ending	3,000,000	3,000,000
Exercisable, Ending	760,000
Weighted Average Exercise Price
Outstanding, Beginning	$ 1.20
Granted		1.20
Outstanding, Ending	1.20	1.20
Exercisable, Ending	$ 1.79
Weighted-average Remaining Life (Years)
Outstanding	1 year 10 months 24 days
Exercisable	2 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding, Beginning
Granted
Outstanding, Ending
Exercisable, Ending

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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.

+ References

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-Publisher FASB
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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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-Publisher FASB
-Name Accounting Standards Codification
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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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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