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Loss per Share (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Dilutive common shares excluded from the calculations of diluted loss per share (in shares) 13.6 2.3
Outstanding Warrants [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Dilutive common shares excluded from the calculations of diluted loss per share (in shares) 8.9  
Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Dilutive common shares excluded from the calculations of diluted loss per share (in shares) 0.1  
Preferred Stock and Restricted Stock Awards [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Dilutive common shares excluded from the calculations of diluted loss per share (in shares) 4.6