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Marketable Debt and Equity Securities - Equity Securities Transactions (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Preferred Stock
Equity Securities
Equity shares estimated fair value	$ 64,209	$ 54,383
Astria/Catabasis | Preferred Stock
Equity Securities
Equity shares estimated fair value	0	174
Zenas | Preferred Stock
Equity Securities
Equity shares estimated fair value	$ 64,209	$ 54,209
License Agreement | INmune | Common Stock
Equity Securities
Number of shares owned	1,885,533
License Agreement | Zenas | Preferred Stock | Milestone
Equity Securities
Equity shares estimated fair value	$ 10,000
Technology License Agreement | Viridian | Common Stock
Equity Securities
Number of shares owned	717,144

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