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Etratech Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 01, 2017
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 55,705 $ 55,705 $ 69,685
Etratech Inc.        
Business Acquisition [Line Items]        
Product revenues   12,070 42,459  
Net income   2,529 2,103  
Net assets acquired $ 65,009      
Cash acquired on acquisition 670      
Gross contractual amount due of accounts receivable 12,654      
Goodwill 14,881      
Goodwill not deductible for income taxes 8,787      
Intangible assets before foreign currency adjustment $ 33,362      
Fluctuations in foreign currency exchange rates that reduced intangible assets value     464  
Amortization of intangibles   $ 943 $ 2,790