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Outstanding warrants to purchase common stock (Details) - $ / shares | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Number of Shares of warrants | 169,335 | 313,375
Common stock financing |  |
Number of Shares of warrants | 35,775 | 35,775
Price Per Share | $ 1.80 | $ 1.8
Senior convertible note financing |  |
Number of Shares of warrants | 133,560 | 277,600
Price Per Share | $ 1.25 | $ 1.25

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- Definition Exercise price per share or per unit 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=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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=26873400&loc=d3e23780-122690 + Details
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