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Detail of Interest and Other Income, Net (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Other Income And Expenses [Abstract] |  |  |
Interest income |  | $ 2,145 | $ 2,229
Dividend income |  |  | 4
Miscellaneous (expense) income | [1] | (39) | 1,650
Loss on disposal of property and equipment |  |  | (116)
Other |  | (7) |
Total interest and other income, net |  | $ 2,099 | $ 3,767
[1] | $1.7 million miscellaneous income for the year ended December 31, 2018 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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