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Inventories, Net and Significant Suppliers - Inventories, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]          
Raw materials $ 62,835   $ 43,638    
Components 13,763   16,214    
Work in process 8,378   1,847    
Finished goods 58,195   105,178    
Reserve for excess and obsolete inventory (7,283)   (4,288) $ (3,125) $ (4,205)
Inventories, net $ 135,888 $ 138,759 $ 162,589