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Warrants (Details) - Warrants - Common stock - $ / shares | Jun. 30, 2017 | Dec. 31, 2016
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2017 |  |
Warrants |  |
Warrant shares (in shares) |  | 6,250
Exercise price (in dollars per share) |  | $ 128.00
2019 |  |
Warrants |  |
Warrant shares (in shares) | 7,030 | 7,030
Exercise price (in dollars per share) | $ 128.00 | $ 128.00
2019 |  |
Warrants |  |
Warrant shares (in shares) | 130 | 130
Exercise price (in dollars per share) | $ 2,520.00 | $ 2,520.00

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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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