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Equity - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 11, 2019
Aug. 02, 2016
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Class of Warrant or Right [Line Items]              
Issuance of common stock     $ 0.0 $ 0.0 $ 0.0 $ 0.0  
CGI | Series A- 2 Preferred Stock              
Class of Warrant or Right [Line Items]              
Issuance and sale of common stock (in shares) 10,000            
Number of shares of preferred stock converted (in shares) 1,420,455            
Issuance of common stock $ 8.3            
Deemed divided $ 1.7            
Corrib Master Fund, Ltd. | Series A shares issued and outstanding              
Class of Warrant or Right [Line Items]              
Issuance and sale of common stock (in shares)   1,000          
Number of shares of preferred stock converted (in shares)         13,734    
Luxor Capital Partners, LP | Series A shares issued and outstanding              
Class of Warrant or Right [Line Items]              
Number of shares of preferred stock converted (in shares)         122,070    
Luxor Capital Partners, LP | Series A-1 shares issued and outstanding              
Class of Warrant or Right [Line Items]              
Issuance and sale of common stock (in shares)   9,000          
Corrib Master Fund, Ltd. and Luxor Capital Partners, LP              
Class of Warrant or Right [Line Items]              
Percent of accrued value         1.875%    
Recurring              
Class of Warrant or Right [Line Items]              
Additional share consideration valued at     $ 0.4   $ 0.4   $ 3.5