8. Share-based payments (Details 2) - Nonemployee Common stock warrants - Fully-vested [Member] - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Number of Warrants
Outstanding, Beginning	8,488,235	2,203,374
Granted	94,333	7,266,666
Exercised		(781,805)
Forfeited or expired	(918,000)	(200,000)
Outstanding, Ending	7,664,568	8,488,235
Exercisable, Ending	7,664,568
Weighted Average Exercise Price
Outstanding, Beginning	$ 0.69	$ 0.69
Granted	0.48	0.74
Exercised		0.31
Forfeited or expired	0.19	0.31
Outstanding, Ending	0.72	0.69
Exercisable, Ending	$ 0.72
Weighted-average Remaining Life (Years)
Outstanding	2 years 2 months 12 days
Exercisable	2 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding, Beginning
Exercised
Forfeited or expired
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.

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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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For presentations that combine terminations, 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 or that expired.

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

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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 price at which option holders acquired shares when converting their stock options into shares.

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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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Number of share options (or share units) exercised during the current period.

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