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Income Taxes - Unrecognized Tax Benefits Related to Uncertain Tax Positions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance as of December 31, 2018	$ 263	$ 95	$ 128
Additions related to current period	0	208	0
Additions related to prior periods	0	0	0
Reductions related to prior periods	(243)	(40)	(33)
Balance as of September 30, 2019	$ 20	$ 263	$ 95

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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