Income Taxes - Summary of Activity of Company's Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 1,320	$ 855	$ 913
Increases related to current period tax positions	652	40	100
Increases (decreases) related to prior period tax positions	3,030	495	(158)
Decreases related to settlements	0
Decreases related to lapsing of statutes of limitations	(111)	(70)
Balance at end of year	$ 4,891	$ 1,320	$ 855