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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
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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value of financial and nonfinancial obligations.

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