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Non-Marketable Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Non-marketable Securities |  |  |  |  |
Purchase of non-marketable securities |  |  | $ 16,900 | $ 77,100 |
Proceeds from redemptions and sales of non-marketable securities |  |  | 30,769 | 73,418 |
Alternative investments measured using the equity method | $ 0 |  | 0 |  | $ 0
Impairment on convertible preferred stock | 3,900 | $ 4,000 | 3,900 | 4,000 |
Convertible preferred stock sold | 1,000 |  | 1,000 |  |
Realized gains on sale of stock | 100 |  | 100 |  |
Purchase of convertible preferred stock | 0 |  | 400 |  |
Unrealized gains (losses) | $ 300 | $ 100 | $ 300 | $ 400 |

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