Fair Value Measurements - Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	$ 41,460	$ 55,485
Over One Year Through Five Years	11,456	17,230
Over Five Years	0	0
Total	52,916	72,715
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	7,477	15,373
Over One Year Through Five Years	0	0
Over Five Years	0	0
Total	7,477	15,373
Yankee bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less		2,588
Over One Year Through Five Years		0
Over Five Years		0
Total		2,588
Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	2,426	6,000
Over One Year Through Five Years	0	0
Over Five Years	0	0
Total	2,426	6,000
Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	6,417	3,528
Over One Year Through Five Years	5,723	8,569
Over Five Years	0	0
Total	12,140	12,097
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	3,114	4,934
Over One Year Through Five Years	0	0
Over Five Years	0	0
Total	3,114	4,934
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	22,026	23,062
Over One Year Through Five Years	5,733	8,661
Over Five Years	0	0
Total	$ 27,759	$ 31,723