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Income Taxes - Reconciliation of Beginning and Ending Amount of Uncertain Tax Positions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 618	$ 657	$ 259
Additions based on tax positions related to the current year		11	454
Additions based on tax positions of prior years			4
Reductions for tax positions of prior years	(41)	(50)	(60)
Balance at end of year	$ 577	$ 618	$ 657

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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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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