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Basis of Presentation - (Details)
$ in Millions
1 Months Ended
Feb. 21, 2017
shares
Jun. 30, 2017
USD ($)
shares
Feb. 20, 2017
shares
Jan. 31, 2017
shares
Jan. 23, 2017
USD ($)
Jan. 22, 2017
Dec. 31, 2016
shares
Related Party Transaction [Line Items]              
Reverse stock split conversion ratio 0.1            
Common stock, shares authorized (in shares) | shares 10,000,000 10,000,000 100,000,000 1,500,000     10,000,000
GBAM Fund              
Related Party Transaction [Line Items]              
Investment amount   $ 10.0          
NXSN Acquisition Corp              
Related Party Transaction [Line Items]              
Noncontrolling interest, percentage held by noncontrolling owners         50.00%    
Senior secured convertible promissory note         $ 25.0    
Noncontrolling interest, percentage held by parent         50.00% 100.00%