Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning Balance	$ 345	$ 799	$ 806
Reductions for tax positions of prior years	(344)	(458)
Translation adjustments	27	4	(7)
Unrecognized tax benefits, Ending Balance	$ 28	$ 345	$ 799