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Fair Value Measurements - Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |  |  |  |
Fair value of investments |  | $ 66,749 |  | $ 75,098 |
Money Market Funds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Fair value of cash equivalents |  | 53,352 | [1] | 55,128 | [2]
Marketable Investments [Member] |  |  |  |  |
Assets: |  |  |  |  |
Fair value of investments | [3] | 13,397 |  | 19,970 |
Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Fair value of investments |  | 53,352 |  | 55,128 |
Level 1 [Member] | Money Market Funds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Fair value of cash equivalents |  | 53,352 | [1] | 55,128 | [2]
Level 1 [Member] | Marketable Investments [Member] |  |  |  |  |
Assets: |  |  |  |  |
Fair value of investments | [3] | 0 |  | 0 |
Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Fair value of investments |  | 13,397 |  | 19,970 |
Level 2 [Member] | Money Market Funds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Fair value of cash equivalents |  | 0 | [1] | 0 | [2]
Level 2 [Member] | Marketable Investments [Member] |  |  |  |  |
Assets: |  |  |  |  |
Fair value of investments | [3] | $ 13,397 |  | $ 19,970 |
[1] | U.S. based funds of $14.6 million are included in cash and cash equivalents and non-U.S. based funds of $38.8 million are included in marketable investments in the Consolidated Balance Sheets.
[2] | U.S. based funds of $23.5 million are included in cash and cash equivalents and non-U.S. based funds of $31.6 million are included in marketable investments in the Consolidated Balance Sheets.
[3] | Marketable investments have been initially valued at the transaction price and subsequently valued, at the end of the reporting period, utilizing third party pricing services or other market observable data. The pricing services utilize industry standard valuation methods, including both income and market-based approaches and observable market inputs to determine value. These observable market inputs include reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events.

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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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