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Segment Information - Narrative (Details)
$ in Millions
6 Months Ended
Jan. 23, 2017
USD ($)
director
Jun. 30, 2018
USD ($)
Jan. 22, 2017
GBAM Fund      
Segment Reporting Information [Line Items]      
Investment amount | $   $ 3.0  
NXSN Acquisition Corp      
Segment Reporting Information [Line Items]      
Noncontrolling interest, percentage held by parent 50.00%   100.00%
Senior secured convertible promissory note | $ $ 25.0    
Noncontrolling interest, percentage held by noncontrolling owners 50.00%    
Number of board directors designated to company | director 2    
Number of board directors | director 5