Income Taxes - Schedule of Income (Loss) from Continuing Operations Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S.	$ 5,556	$ (24,890)	$ 28,642
Non-U.S.	(5,924)	(2,159)	(5,757)
Income (loss) before income taxes	$ (368)	$ (27,049)	$ 22,885