Income Taxes - Reconciliation of the Company's Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Beginning Balance	$ 9,714	$ 8,786
Additions for current tax positions	3,455	928
Additions for prior tax positions	12,090
Ending Balance	$ 25,259	$ 9,714