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Summary of Gross Carrying Amount and Accumulated Amortization for Intangible Assets Resulting from Acquisitions (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 15,239 $ 15,239
Accumulated amortization (10,511) (9,419)
Intangible Assets, net $ 4,728 5,820
Existing Technology    
Acquired Finite Lived Intangible Assets [Line Items]    
Amortization period (in years) 11 years 9 months  
Gross carrying amount $ 4,600 4,600
Accumulated amortization (3,145) (2,809)
Intangible Assets, net 1,455 1,791
Customer Relationship    
Acquired Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 10,639 10,639
Accumulated amortization (7,366) (6,610)
Intangible Assets, net $ 3,273 $ 4,029
Customer Relationship | Minimum    
Acquired Finite Lived Intangible Assets [Line Items]    
Amortization period (in years) 4 years  
Customer Relationship | Maximum    
Acquired Finite Lived Intangible Assets [Line Items]    
Amortization period (in years) 11 years 9 months