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Intangible Assets, Net - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Net [Abstract]    
Intangible assets $ 19,773 $ 19,773
Less accumulated amortization (14,950) (8,056)
Total $ 4,823 $ 11,717