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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Short-term, Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost | $ 297,963 | $ 246,070
Total short-term investments (available for sale), Gross Unrealized Gain | 1,071 | 466
Total short-term investments (available for sale), Gross Unrealized (Loss) | (59) | (278)
Total short-term investments (available for sale), Fair value | 298,975 | 246,258
Short-term, Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost | 188,485 | 213,394
Total short-term investments (available for sale), Gross Unrealized Gain | 444 | 258
Total short-term investments (available for sale), Gross Unrealized (Loss) | (61) | (115)
Total short-term investments (available for sale), Fair value | 188,868 | 213,537
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost | 486,448 | 459,464
Total short-term investments (available for sale), Gross Unrealized Gain | 1,515 | 724
Total short-term investments (available for sale), Gross Unrealized (Loss) | (120) | (393)
Total short-term investments (available for sale), Fair value | $ 487,843 | $ 459,795

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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