Income Taxes - Schedule of Income (Loss) before Income Tax Domestic and Foreign (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Income (loss) before income taxes, US	$ 10,284	$ (1,734)	$ (6,696)
Income (loss) before income taxes, Switzerland	(363)	(293)	181
Net income (loss) before income taxes	$ 9,921	$ (2,027)	$ (6,515)