Going concern (Details) (USD $)
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3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 151 Months Ended | 160 Months Ended | |||||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2000
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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Dec. 31, 2007
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Dec. 31, 2006
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Dec. 31, 2005
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Dec. 31, 2004
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Dec. 31, 2003
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Dec. 31, 2002
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Dec. 31, 2001
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Dec. 31, 2012
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Sep. 30, 2013
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Going Concern (Textual) | |||||||||||||||||||
Net loss | $ (1,420,913) | $ (3,012,454) | $ (672,286) | $ (4,893,951) | $ (5,483,954) | $ (8,361,205) | $ (3,444,795) | $ (467,266) | $ (3,425,986) | $ (5,570,905) | $ (5,617,581) | $ (6,053,362) | $ (4,580,237) | $ (5,734,791) | $ (3,532,044) | $ (3,192,384) | $ (5,090,621) | $ (55,743,463) | $ (60,637,414) |
Net cash used in operations | (4,947,969) | (3,795,480) | (5,212,710) | (517,592) | (44,402,658) | (49,350,627) | |||||||||||||
Accumulated deficit | $ 60,637,414 | $ 60,637,414 | $ 55,743,463 | $ 47,382,258 | $ 55,743,463 | $ 60,637,414 |