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Non-Marketable Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Non-marketable Securities |  |  |  |  |
Purchase of non-marketable securities |  |  | $ 26,200 | $ 93,900 |
Proceeds from redemptions and sales of non-marketable securities |  |  | 42,559 | 90,293 |
Alternative investments measured using the equity method | $ 0 |  | 0 |  | $ 0
Impairment on convertible preferred stock |  |  | 3,900 | 4,000 |
Convertible preferred stock sold |  |  | 1,000 |  |
Realized gains on sale of stock |  |  | 100 |  |
Purchase of convertible preferred stock | 0 |  | 400 |  |
Equity method investments | 25,400 |  | 25,400 |  | 24,600
Equity method investments without a readily determinable fair value | 1,800 |  | 1,800 |  | 0
Unrealized gains (losses) | $ 400 | $ 0 | 700 | $ (400) |
Impairment related to equity method investments |  |  | $ 0 |  | $ 0

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