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Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Beginning uncertain tax benefits	$ 1,734	$ 1,633	$ 1,550
Prior year—increases	296
Prior year—decreases	(762)	(20)
Current year—increases	5,547	121	83
Ending uncertain tax benefits	$ 6,815	$ 1,734	$ 1,633

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Amount of unrecognized tax benefits.

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

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