Other Income, net - Summary of Other Income, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Gain on sale and mark-to-market of mutual funds and money market funds	$ 4,891	$ 9,615	$ 13,180
Interest and dividend income	2,726	2,501	2,184
Others, net	(844)	(51)	1,143
Other income, net	$ 6,773	$ 12,065	$ 16,507