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Detail of Other Income, Net (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Income And Expenses [Abstract]    
Interest income $ 2,229 $ 215
Dividend income 4 50
Miscellaneous income (expense) [1] 1,650 (1)
Loss on disposal of property and equipment (116) (3)
Total other income, net $ 3,767 $ 261
[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.