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Capitalization - Warrants (Details) - Common stock - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Period One    
Warrants    
Warrant shares (in shares) 7,030 7,030
Exercise price (in dollars per share) $ 128.00 $ 128.00
Period Five    
Warrants    
Warrant shares (in shares) 130 130
Exercise price (in dollars per share) $ 2,520.00 $ 2,520.00