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Detail of Interest and Other Income, Net (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Other Income And Expenses [Abstract] |  |  |
Miscellaneous (expense) income | [1] | $ (39) | $ 1,650
Milestone payment received |  |  | $ 1,500
[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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Balance Type: | credit
Period Type: | duration

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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