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Subsequent Event (Details) - USD ($)
$ / shares in Units, $ in Millions
Aug. 09, 2019
Jul. 26, 2019
Aug. 06, 2018
Jun. 30, 2019
Dec. 31, 2018
Subsequent Event [Line Items]          
Number of shares issued (in shares)     12,062,000    
Common stock, par value (in dollars per share)     $ 0.001 $ 0.001 $ 0.001
Subsequent Event          
Subsequent Event [Line Items]          
Number of shares issued (in shares)   196,463      
Common stock, par value (in dollars per share)   $ 0.001      
Series E Preferred Stock | Subsequent Event          
Subsequent Event [Line Items]          
Preferred stock issued (in shares) 10,000        
Preferred stock issued during the period $ 10.0        
Dividend rate 9.00%        
Redemption price, percent 110.00%        
Base amount (in dollars per share) $ 1,000