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