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Fair Value Measurements - Fair Value Hierarchy (Details) - Fair Value, Measurements, Recurring - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Total assets | $ 259,873,000 | $ 294,695,000
Liabilities |  |
Total liabilities | 10,303,000 | 8,178,000
Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 25,533,000 | 53,106,000
Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 234,340,000 | 241,589,000
Liabilities |  |
Total liabilities | 10,303,000 | 8,178,000
Fair Value, Inputs, Level 3 |  |
Assets |  |
Total assets | 0 | 0
Liabilities |  |
Total liabilities | 0 | 0
Money market funds |  |
Assets |  |
Total assets | 25,533,000 | 53,106,000
Money market funds | Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 25,533,000 | 53,106,000
U.S. government agency bonds |  |
Assets |  |
Total assets | 47,331,000 | 86,065,000
U.S. government agency bonds | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 47,331,000 | 86,065,000
U.S. treasury securities |  |
Assets |  |
Cash equivalents | 31,995,000 |
Total assets | 127,604,000 | 52,607,000
U.S. treasury securities | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 127,604,000 | 52,607,000
Bank certificates of deposit |  |
Assets |  |
Total assets | 11,300,000 | 17,492,000
Bank certificates of deposit | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 11,300,000 | 17,492,000
Corporate notes |  |
Assets |  |
Total assets | 21,712,000 | 40,486,000
Corporate notes | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 21,712,000 | 40,486,000
Asset-backed securities |  |
Assets |  |
Total assets | 8,387,000 | 21,296,000
Asset-backed securities | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 8,387,000 | 21,296,000
Municipal bonds |  |
Assets |  |
Total assets | 7,589,000 | 15,224,000
Municipal bonds | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 7,589,000 | 15,224,000
Investments held for deferred compensation plans |  |
Assets |  |
Total assets | 10,417,000 | 8,419,000
Liabilities |  |
Total liabilities | 10,303,000 | 8,178,000
Investments held for deferred compensation plans | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 10,417,000 | 8,419,000
Liabilities |  |
Total liabilities | $ 10,303,000 | $ 8,178,000

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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