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Fair Value of Financial Instruments - Schedule of Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value of financial instruments |  |  |
Debt securities (government) | $ 467,235 | $ 442,667 | [1]
Short term equity investments | 3,344 | 0 | [1]
Long term equity investments | 27,566 | 187,716 | [1]
Fair Value, Recurring | Estimate of Fair Value Measurement |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 1,304,109 | 3,213,376 |
Debt securities (government) | 467,235 | 442,667 |
Short term equity investments | 3,344 |  |
Long term equity investments | 27,566 | 187,716 |
Total assets | 1,802,254 | 3,843,759 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 1,304,109 | 3,213,376 |
Debt securities (government) | 0 | 0 |
Short term equity investments | 3,344 |  |
Long term equity investments | 27,566 | 187,716 |
Total assets | 1,335,019 | 3,401,092 |
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 0 | 0 |
Debt securities (government) | 467,235 | 442,667 |
Short term equity investments | 0 |  |
Long term equity investments | 0 | 0 |
Total assets | 467,235 | 442,667 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 0 | 0 |
Debt securities (government) | 0 | 0 |
Short term equity investments | 0 |  |
Long term equity investments | 0 | 0 |
Total assets | $ 0 | $ 0 |
[1] | The condensed consolidated balance sheet at December 31, 2023 has been derived from the audited consolidated financial statements at that date.

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