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Related Parties - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 22, 2016
Apr. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
DMi        
Related Party Transaction [Line Items]        
Shares purchased from the Chairman of the Board and former executives, amount $ 4.0 $ 16.1    
Shares purchased from the Chairman of the Board and former executives (in shares) 41,204      
GMH        
Related Party Transaction [Line Items]        
Management fees paid     $ 0.7 $ 0.7
Affiliated Entity | Harbinger Capital Partners        
Related Party Transaction [Line Items]        
Expenses under service agreement     $ 3.1 $ 1.8