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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, 2016
Dec. 31, 2015
Acquired Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 15,239 $ 15,239
Accumulated amortization (9,056) (7,964)
Intangible Assets, net $ 6,183 7,275
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 (2,697) (2,361)
Intangible Assets, net 1,903 2,239
Customer Relationship    
Acquired Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 10,639 10,639
Accumulated amortization (6,359) (5,603)
Intangible Assets, net $ 4,280 $ 5,036
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