Fair Value Measurements - Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	$ 72,105	$ 111,409
Over One Year Through Five Years	23,920	63,400
Over Five Years	0	0
Total	96,025	174,809
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	25,675	40,795
Over One Year Through Five Years	0	14,980
Over Five Years	0	0
Total	25,675	55,775
Yankee bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	2,568	2,734
Over One Year Through Five Years	0	2,532
Over Five Years	0	0
Total	2,568	5,266
Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	3,572	6,470
Over One Year Through Five Years	2,371	5,899
Over Five Years	0	0
Total	5,943	12,369
Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	2,962	0
Over One Year Through Five Years	8,941	11,811
Over Five Years	0	0
Total	11,903	11,811
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	2,973	2,854
Over One Year Through Five Years	0	0
Over Five Years	0	0
Total	2,973	2,854
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	9,145	23,179
Over One Year Through Five Years	0	1,940
Over Five Years	0	0
Total	9,145	25,119
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
One Year or Less	25,210	35,377
Over One Year Through Five Years	12,608	26,238
Over Five Years	0	0
Total	$ 37,818	$ 61,615