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Investments and Fair Value Measurements - Summary Of Assets And Liabilities That Are Measured At Fair Value On A Recurring And Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Marketable securities: |  |
Debt securities | $ 4,779,769 | $ 3,110,687
Total | 5,798,389 | 4,959,335
Level 1 |  |
Marketable securities: |  |
Total | 1,013,786 | 1,843,822
Level 2 |  |
Marketable securities: |  |
Total | 4,784,603 | 3,115,513
Level 3 |  |
Marketable securities: |  |
Total | 0 | 0
U.S. Treasury securities |  |
Marketable securities: |  |
Debt securities | 4,779,769 | 3,110,687
Cash and Cash Equivalents | Money market funds |  |
Cash and cash equivalents: |  |
Cash and cash equivalents | 971,705 | 1,823,046
Cash and Cash Equivalents | Money market funds | Level 1 |  |
Cash and cash equivalents: |  |
Cash and cash equivalents | 971,705 | 1,823,046
Cash and Cash Equivalents | Money market funds | Level 2 |  |
Cash and cash equivalents: |  |
Cash and cash equivalents | 0 | 0
Cash and Cash Equivalents | Money market funds | Level 3 |  |
Cash and cash equivalents: |  |
Cash and cash equivalents | 0 | 0
Prepaid Expenses and Other Current Assets and Other Assets | Certificates of deposit |  |
Prepaid expenses and other current assets and other assets: |  |
Certificates of deposit | 4,834 | 4,826
Prepaid Expenses and Other Current Assets and Other Assets | Certificates of deposit | Level 1 |  |
Prepaid expenses and other current assets and other assets: |  |
Certificates of deposit | 0 | 0
Prepaid Expenses and Other Current Assets and Other Assets | Certificates of deposit | Level 2 |  |
Prepaid expenses and other current assets and other assets: |  |
Certificates of deposit | 4,834 | 4,826
Prepaid Expenses and Other Current Assets and Other Assets | Certificates of deposit | Level 3 |  |
Prepaid expenses and other current assets and other assets: |  |
Certificates of deposit | 0 | 0
Marketable Securities | U.S. Treasury securities |  |
Marketable securities: |  |
Debt securities | 4,779,769 | 3,110,687
Marketable Securities | U.S. Treasury securities | Level 1 |  |
Marketable securities: |  |
Debt securities | 0 | 0
Marketable Securities | U.S. Treasury securities | Level 2 |  |
Marketable securities: |  |
Debt securities | 4,779,769 | 3,110,687
Marketable Securities | U.S. Treasury securities | Level 3 |  |
Marketable securities: |  |
Debt securities | 0 | 0
Marketable Securities | Publicly-traded equity securities |  |
Marketable securities: |  |
Publicly-traded equity securities | 42,081 | 20,776
Marketable Securities | Publicly-traded equity securities | Level 1 |  |
Marketable securities: |  |
Publicly-traded equity securities | 42,081 | 20,776
Marketable Securities | Publicly-traded equity securities | Level 2 |  |
Marketable securities: |  |
Publicly-traded equity securities | 0 | 0
Marketable Securities | Publicly-traded equity securities | Level 3 |  |
Marketable securities: |  |
Publicly-traded equity securities | $ 0 | $ 0

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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/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: 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 5: 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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