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Detail of Interest and Other Income, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Income And Expenses [Abstract]
Interest income	$ 74	$ 489	$ 536	$ 1,763
Miscellaneous income			679
Other	(7)		(20)	(41)
Total interest and other income, net	$ 67	$ 489	$ 1,195	$ 1,722

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- Definition

Interest and other income (expense), net.

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The net amount of nonoperating interest income (expense).

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Amount of expense related to nonoperating activities, classified as other.

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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)
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Amount of income related to nonoperating activities, classified as other.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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