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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.

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