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Capital structure (Details 3) - Common stock - $ / shares | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
2017 |  |
Class of Warrant or Right [Table] |  |
Warrant shares | 6,250 | 6,250
Exercise price (in dollars per share) | $ 128.00 | $ 128.00
2019. |  |
Class of Warrant or Right [Table] |  |
Warrant shares | 7,030 | 7,030
Exercise price (in dollars per share) | $ 128.00 | $ 128.00
2019 |  |
Class of Warrant or Right [Table] |  |
Warrant shares | 130 | 130
Exercise price (in dollars per share) | $ 2,520.00 | $ 2,520.00

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