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Derivative liability - Summary of derivative liability (Details) (USD $)
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12 Months Ended | 45 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
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| Schedule Of Derivative Liabilities [Roll Forward] | ||||
| Opening balance | $ 121,000 | $ 106,146 | ||
| Issuance of units | 3,681,372 | 333,356 | ||
| Dividend warrant liability acquired on reverse acquisition | 2,041,680 | |||
| Warrants issued for services | 124,020 | 49,379 | ||
| Change in fair value of derivative liability | (1,324,051) | (318,502) | (1,642,553) | |
| Reclassification to equity upon exercise of warrants | (241,715) | |||
| Closing balance | $ 4,402,306 | $ 121,000 | $ 106,146 | $ 4,402,306 |