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5. Stock options and warrants (Details 2) (Warrant [Member], USD $)
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6 Months Ended |
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Jun. 30, 2013
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Warrant [Member]
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| Beginning Balance | 42,205,507 |
| Granted | 150,000 |
| Exercised | (19,907,130) |
| Forfeited or expired | (958,723) |
| Ending Balance | 21,489,654 |
| Vested and exercisable | 20,206,320 |
| Weighted Average Exercise Price, Outstanding Beggining Balance | $ 0.31 |
| Weighted Average Exercise Price, Granted | $ 0.3 |
| Weighted Average Exercise Price, Exercised | $ 0.29 |
| Weighted Average Exercise Price, Forfeited or expired | $ 0.35 |
| Weighted Average Exercise Price, Outstanding Ending Balance | $ 0.32 |
| Weighted Average Exercise Price, Vested and exercisable | $ 0.32 |
| Weighted-Average Remaining Contractual Term, Outstanding | 2 years |
| Weighted-Average Remaining Contractual Term, Vested and exercisable | 1 year 7 months 6 days |
| Aggregate Intrinsic Value, Outstanding | $ 18,752,321 |
| Aggregate Intrinsic Value, Vested and exercisable | $ 17,781,988 |
| X | ||||||||||
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- Definition
Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average price of options that were either forfeited or expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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| X | ||||||||||
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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| X | ||||||||||
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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