Fair Value Measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Assets:
Cash and cash equivalents	$ 195,889	$ 168,481	$ 167,707
Recurring
Assets:
Total assets at fair value on a recurring basis	134,604	110,267
Tax-exempt municipal securities | Recurring
Assets:
Available-for-sale securities		9,913
Corporate debt securities | Recurring
Assets:
Available-for-sale securities	1,990	3,123
Money market funds | Recurring
Assets:
Cash and cash equivalents	102,754	92,231
U.S. treasury bills | Recurring
Assets:
Cash and cash equivalents	29,860	5,000
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Recurring
Assets:
Total assets at fair value on a recurring basis	132,614	97,231
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Tax-exempt municipal securities | Recurring
Assets:
Available-for-sale securities		0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Corporate debt securities | Recurring
Assets:
Available-for-sale securities	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Money market funds | Recurring
Assets:
Cash and cash equivalents	102,754	92,231
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | U.S. treasury bills | Recurring
Assets:
Cash and cash equivalents	29,860	5,000
Significant Other Observable Inputs (Level 2) | Recurring
Assets:
Total assets at fair value on a recurring basis	1,990	13,036
Significant Other Observable Inputs (Level 2) | Tax-exempt municipal securities | Recurring
Assets:
Available-for-sale securities		9,913
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Recurring
Assets:
Available-for-sale securities	1,990	3,123
Significant Other Observable Inputs (Level 2) | Money market funds | Recurring
Assets:
Cash and cash equivalents	0	0
Significant Other Observable Inputs (Level 2) | U.S. treasury bills | Recurring
Assets:
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Recurring
Assets:
Total assets at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Tax-exempt municipal securities | Recurring
Assets:
Available-for-sale securities		0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Recurring
Assets:
Available-for-sale securities	0	0
Significant Unobservable Inputs (Level 3) | Money market funds | Recurring
Assets:
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | U.S. treasury bills | Recurring
Assets:
Cash and cash equivalents	$ 0	$ 0