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Detail of Other Income, Net (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Income And Expenses [Abstract]    
Miscellaneous income (expense) [1] $ 1,650 $ (1)
Milestone payment received $ 1,500  
[1] $1.7 million miscellaneous income is mainly composed of a $1.5 million milestone payment received under an agreement associated with neuronal nicotinic receptor (“NNR”) assets sold in 2016.