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Business Combination - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 11, 2017
Oct. 31, 2017
Sep. 30, 2017
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Business Acquisition [Line Items]            
Purchase price of acquisition       $ 59,178 $ 0  
Goodwill     $ 117,435 $ 117,435   $ 82,554
Lightning Diversion Systems, Inc.            
Business Acquisition [Line Items]            
Percentage of outstanding common stock acquired 100.00%          
Purchase price of acquisition $ 60,000          
Payments to acquire business 61,400          
Preliminary purchase price allocation 62,021          
Intangible assets 22,400          
Goodwill $ 34,881          
Acquisition related costs     $ 300      
Subsequent Event | Lightning Diversion Systems, Inc.            
Business Acquisition [Line Items]            
Payments to acquire business   $ 600