Income Taxes - Summary of Changes in Deferred Tax Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Deferred tax valuation allowance, Beginning Balance	$ 2,274	$ 2,574	$ 2,686
Additions	52	30	74
Deductions	(1,134)	(356)	(139)
Change in tax legislation	2
Translation adjustments	43	26	(47)
Deferred tax valuation allowance, Ending Balance	$ 1,237	$ 2,274	$ 2,574