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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Assets Net [Abstract]    
Intangible assets $ 23,773 $ 2,500
Less accumulated amortization (9,732) (1,194)
Total $ 14,041 $ 1,306