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Intangible Assets, Net - Estimated Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
For the remaining three months ending December 31, 2017 $ 625  
2018 2,500  
2019 2,500  
2020 2,500  
2021 417  
Total amortizable intangible assets $ 8,542 $ 10,803