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Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Finite Lived Intangible Assets Accumulated Amortization Addition $ 3.9 $ 4.4
Exclusivity [Member]    
Finite Lived Intangible Assets Accumulated Amortization Addition $ 0.1 $ 0.1