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Preferred Stock - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
Mar. 31, 2016
Tranche
shares
Dec. 31, 2017
USD ($)
shares
Class Of Stock [Line Items]        
Number of tranches sold to investors | Tranche     2  
Preferred Series A dividends payable | $ $ 22.9     $ 22.9
Preferred stock dividend paid | $ $ 22.9      
Accrued preferred dividends payable date May 14, 2018      
Deemed dividends on Series A Preferred Stock | $ $ 7.0 $ 6.1    
Series A Preferred Stock [Member]        
Class Of Stock [Line Items]        
Preferred Stock, Shares Issued 965,100     965,100
Private Placement [Member] | Series A Warrants [Member]        
Class Of Stock [Line Items]        
Warrants exercisable     13,550,004  
Private Placement [Member] | Series B Warrants [Member]        
Class Of Stock [Line Items]        
Warrants exercisable     6,533,727  
Private Placement [Member] | Series A Preferred Stock [Member]        
Class Of Stock [Line Items]        
Preferred Stock, Shares Issued     965,100