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Income Taxes - Schedule of Reconciliation of the Beginning and Ending Amounts of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits at January 1	$ 24,464	$ 18,588	$ 14,026
Gross increases - prior period tax positions	8,960	5,345	0
Gross decreases - prior period tax positions	(1,006)	(957)	(2,280)
Gross increases - current period tax positions	880	1,488	6,842
Gross unrecognized tax benefits at December 31	$ 33,298	$ 24,464	$ 18,588

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
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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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