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Warrants (Details) - Warrants - Common stock - $ / shares
Jun. 30, 2016
Dec. 31, 2015
2017    
Warrants    
Warrant shares 6,250 6,250
Exercise price (in dollars per share) $ 128.00 $ 128.00
2019    
Warrants    
Warrant shares 7,030 7,030
Exercise price (in dollars per share) $ 128.00 $ 128.00
2019.    
Warrants    
Warrant shares 130 130
Exercise price (in dollars per share) $ 2,520.00 $ 2,520.00