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Going concern (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 151 Months Ended | 157 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2000 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2006 | Dec. 31, 2005 | Dec. 31, 2004 | Dec. 31, 2003 | Dec. 31, 2002 | Dec. 31, 2001 | Dec. 31, 2012 | Jun. 30, 2013
Going Concern (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (2,784,011) | $ (1,562,591) | $ (3,473,038) | $ (2,471,500) | $ (672,286) | $ (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) | $ (59,216,501)
Net cash used in operations |  |  | (3,327,820) | (1,862,232) |  | (5,212,710) | (517,592) |  |  |  |  |  |  |  |  |  |  | (44,402,658) | (47,730,478)
Accumulated deficit | $ 59,216,501 |  | $ 59,216,501 |  |  | $ 55,743,463 |  |  |  |  |  |  |  |  |  |  |  | $ 55,743,463 | $ 59,216,501

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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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