Income Taxes - Income by Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ (11,529)	$ (1,449)	$ 25,751
Foreign	5,238	3,519	2,353
Income (loss) before provision for income taxes	$ (6,291)	$ 2,070	$ 28,104