Income Taxes - Summary of Activity of Company's Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 4,891	$ 1,320	$ 855
Increases related to current period tax positions	8,186	652	40
Increases (decreases) related to prior period tax positions	1,061	3,030	495
Decreases related to settlements		0
Decreases related to lapsing of statutes of limitations	(248)	(111)	(70)
Balance at end of year	$ 13,890	$ 4,891	$ 1,320