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Intangible Assets - Schedule of Net Book Value of Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Intangible assets, net $ 27,669 $ 30,129
DEXYCU [Member]    
Intangible assets, net $ 27,669 $ 30,129
Finite-lived intangible asset expected amortization life 11 years 3 months