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Non-Marketable Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Non-marketable Securities |  |  |  |  |
Purchase of non-marketable securities |  |  | $ 93,900 | $ 11,500 |
Proceeds from non-marketable securities |  |  | 90,293 | 64 |
Alternative investments measured using the equity method | $ 0 |  | 0 |  |
Impairments on equity securities |  |  | 4,000 |  | $ 0
Unrealized gains (losses) | $ 0 | $ 1,300 | $ (400) | $ 1,400 |

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