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Segment Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 23, 2017
USD ($)
director
Mar. 31, 2018
USD ($)
Dec. 31, 2015
segment
Jan. 22, 2017
Segment Reporting Information [Line Items]        
Number of reporting segments | segment     3  
GBAM Fund        
Segment Reporting Information [Line Items]        
Investment amount | $   $ 4.0    
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