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Marketable Debt and Equity Securities - Equity Securities without Readily Determinable Fair Value (Details) - Preferred Stock - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Equity securities without readily determinable fair value    
Equity Securities without Readily Determinable Fair Value $ 31,124 $ 31,262
Astria/Catabasis    
Equity securities without readily determinable fair value    
Equity Securities without Readily Determinable Fair Value 174 312
Zenas Bio Pharma Limited    
Equity securities without readily determinable fair value    
Equity Securities without Readily Determinable Fair Value $ 30,950 $ 30,950