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Etratech Acquisition - Summary of Preliminary Allocation (Detail) - USD ($)
$ in Thousands
6 Months Ended
Nov. 01, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 68,845   $ 69,685
Purchase price   $ 15 $ 2,000  
Etratech Inc.        
Business Acquisition [Line Items]        
Accounts receivable $ 12,654      
Inventory 7,014      
Prepaid expenses and other assets 535      
Property and equipment 6,205      
Goodwill 14,881      
Assumed liabilities (9,642)      
Net assets acquired 65,009      
Cash acquired 670      
Purchase price 65,679      
Etratech Inc. | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets 24,774      
Etratech Inc. | Technology        
Business Acquisition [Line Items]        
Intangible assets $ 8,588