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Business Combinations - Summary of Estimated Amortization Expense for Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Acquired Indefinite Lived Intangible Assets [Line Items]    
Acquired Intangibles, Net $ 3,011 $ 3,266
Glip, Inc.    
Acquired Indefinite Lived Intangible Assets [Line Items]    
2016 (remaining) 767  
2017 782  
2018 602  
2019 602  
2020 258  
Acquired Intangibles, Net $ 3,011