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Acquisitions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) - Precisive, LLC [Member] - USD ($)
$ in Thousands
 12 Months Ended
Mar. 17, 2015
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price $ 5,110 $ 5,110
Order Backlog [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price $ 50  
Estimated useful life of finite-lived intangible assets 18 months  
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price $ 1,430 $ 1,430
Estimated useful life of finite-lived intangible assets 8 years  
Exclusive Patent License [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price $ 2,600  
Estimated useful life of finite-lived intangible assets 10 years  
Trade names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price $ 210  
Estimated useful life of finite-lived intangible assets 10 years  
Developed Technology [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, purchase price $ 820  
Estimated useful life of finite-lived intangible assets 10 years