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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