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Non-Marketable Securities - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Non-marketable Securities |  |  |
Purchase of non-marketable securities | $ 106,200 | $ 37,300 |
Proceeds from non-marketable securities | 100,046 | 4,175 | $ 2,006
Alternative investments measured using the equity method | 0 | 0 |
Impairments on equity securities | 4,000 | 0 |
Unrealized gains (losses) | $ (35) | $ 1,400 |

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