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Outstanding warrants to purchase common stock (Details) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Number of Shares of warrants | 607,776 | 624,442
Common stock financing |  |
Number of Shares of warrants | 57,776 | 74,442
Price Per Share | 1.8 | 1.8
Issue Date | 2009-05 | 2009-05
Expiration Date | 2014-05 | 2014-05
Senior convertible note financing |  |
Number of Shares of warrants | 550,000 | 550,000
Price Per Share | 2.44 | 2.44
Issue Date | 2010-11 | 2010-11
Expiration Date | 2016-05 | 2016-05

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- Definition The exercise price of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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