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Acquisition - Summary of Allocation of Consideration to Fair Value of Tangible and Intangible Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 15, 2016
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill   $ 37,448 $ 34,972
Camouflage Software, Inc [Member]      
Business Acquisition [Line Items]      
Goodwill $ 2,476    
Total intangible assets acquired 4,286    
Other acquired tangible assets 363    
Liability assumed (130)    
Fair value of assets acquired 4,519    
Camouflage Software, Inc [Member] | Acquired Technology [Member]      
Business Acquisition [Line Items]      
Intangible assets acquired other than goodwill 1,050    
Camouflage Software, Inc [Member] | Customer Relationships [Member]      
Business Acquisition [Line Items]      
Intangible assets acquired other than goodwill 480    
Camouflage Software, Inc [Member] | Trade Name and Other [Member]      
Business Acquisition [Line Items]      
Intangible assets acquired other than goodwill $ 280