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Investments - Summary of fair value of available for sale securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | $ 420,850 | $ 124,420
Money market funds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 20,884 | 29,806
Fair Value | 20,884 | 29,806
U.S. treasury securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost |  | 24,835
Fair Value |  | 24,835
Cash equivalents |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 20,884 | 54,641
Fair Value | 20,884 | 54,641
US treasury securities, short term |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 420,331 | 124,352
Unrealized Gains | 519 | 69
Unrealized Losses |  | (1)
Fair Value | 420,850 | 124,420
US treasury securities, long term |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 111,710 | 25,059
Unrealized Gains | 261 | 9
Unrealized Losses | (16) |
Fair Value | 111,955 | 25,068
Available-for-sale investments - short-term |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 420,331 | 124,352
Unrealized Gains | 519 | 69
Unrealized Losses |  | (1)
Fair Value | 420,850 | 124,420
Available-for-sale investments - long-term |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 111,710 | 25,059
Unrealized Gains | 261 | 9
Unrealized Losses | (16) |
Fair Value | $ 111,955 | $ 25,068

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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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