Investments - Schedule of Investments' Gross Unrealized Loss and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	$ 20,712	$ 2,803
Unrealized Losses, Less than 12 Months	(384)	(11)
Fair Value, 12 Months or More	959	0
Unrealized Losses, 12 Months or More	(41)	0
Fair Value	21,671	2,803
Unrealized Losses	(425)	(11)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	16,792	1,995
Unrealized Losses, Less than 12 Months	(322)	(5)
Fair Value, 12 Months or More	959	0
Unrealized Losses, 12 Months or More	(41)	0
Fair Value	17,751	1,995
Unrealized Losses	(363)	(5)
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	3,920	808
Unrealized Losses, Less than 12 Months	(62)	(6)
Fair Value, 12 Months or More	0	0
Unrealized Losses, 12 Months or More	0	0
Fair Value	3,920	808
Unrealized Losses	$ (62)	$ (6)