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Supplemental Information - Summary of Components of Interest, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Interest expense	$ (1,435)	$ (1,490)	$ (1,257)
Interest income	557	1,600	1,521
Total	$ (878)	$ 110	$ 264

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Amount of the cost of borrowed funds accounted for as interest expense.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
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The net amount of nonoperating interest income (expense).

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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