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Fair Value Measurements, Cash Equivalents and Marketable Securities - Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortization cost, cash and cash equivalents | $ 1,029,027 |  | $ 223,640
Amortized cost, cash and cash equivalents and debt securities available-for-sale | 1,067,288 | $ 1,067,608 |
Gross Unrealized Gain | 2 | 0 |
Gross Unrealized Loss | 0 | (11) |
Cash, cash equivalents and debt securities, fair value | 1,067,290 | 1,067,597 |
Money market funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortization cost, cash and cash equivalents | 638,715 | 1,032,500 |
Gross Unrealized Gain | 0 | 0 |
Gross Unrealized Loss | 0 | 0 |
Estimated fair value, cash and cash equivalents | 638,715 | 1,032,500 |
Fixed income bond funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost, debt securities, available-for-sale | 100,080 |  |
Gross Unrealized Gain | 0 |  |
Gross Unrealized Loss | 0 |  |
Estimated fair value, debt securities | 100,080 |  |
U.S. government debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost, debt securities, available-for-sale | 328,493 | 35,108 |
Gross Unrealized Gain | 2 | 0 |
Gross Unrealized Loss | 0 | (11) |
Estimated fair value, debt securities | $ 328,495 | $ 35,097 |

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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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