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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Fair Value of Financial Instruments |  |  |
Money Market Funds | $ 30,768 | $ 53,790 | $ 34,710
Marketable securities | 554,234 |  |
Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Total Fair Value | 565,858 | 668,757 |
Money Market Funds |  |  |
Fair Value of Financial Instruments |  |  |
Money Market Funds | 11,624 | 25,520 |
Money Market Funds | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Money Market Funds | 11,624 | 25,520 |
Corporate Securities |  |  |
Fair Value of Financial Instruments |  |  |
Marketable securities | 211,657 | 228,723 |
Corporate Securities | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Marketable securities | 211,657 | 228,723 |
Government Securities |  |  |
Fair Value of Financial Instruments |  |  |
Marketable securities | 342,577 | 414,514 |
Government Securities | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Marketable securities | 342,577 | 414,514 |
Level 1 | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Total Fair Value | 11,624 | 25,520 |
Level 1 | Money Market Funds | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Money Market Funds | 11,624 | 25,520 |
Level 1 | Corporate Securities | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Marketable securities | 0 | 0 |
Level 1 | Government Securities | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Marketable securities | 0 | 0 |
Level 2 | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Total Fair Value | 554,234 | 643,237 |
Level 2 | Money Market Funds | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Money Market Funds | 0 | 0 |
Level 2 | Corporate Securities | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Marketable securities | 211,657 | 228,723 |
Level 2 | Government Securities | Fair Value, Recurring |  |  |
Fair Value of Financial Instruments |  |  |
Marketable securities | $ 342,577 | $ 414,514 |

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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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