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Intangible Assets, Net - Estimated Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
For the remaining nine months ending December 31, 2018 $ 1,875  
2019 2,500  
2020 2,500  
2021 417  
Total amortizable intangible assets $ 7,292 $ 7,917