Variable Interest Entity and Equity Method of Accounting (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Feb. 04, 2022	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Jan. 23, 2023
Class of Stock [Line Items]
Gain (loss) on investments		$ (467)	$ 0
Charter Bioscience Inc.
Class of Stock [Line Items]
Gain (loss) on investments		$ (500)	$ 0	$ (4,700)	$ 9,200
Charter Bioscience Inc. | Second Private Capital Transaction
Class of Stock [Line Items]
Ownership percentage						23.92%
Charter Bioscience Inc. | Private Capital Transaction
Class of Stock [Line Items]
Ownership percentage	25.46%
Charter Bioscience Inc. | Preferred stock | Other assets
Class of Stock [Line Items]
Equity interest at fair value	$ 4,900
Charter Bioscience Inc. | Common stock
Class of Stock [Line Items]
Equity Method Investments	3,700
Charter Bioscience Inc. | Preferred stock | Second Private Capital Transaction
Class of Stock [Line Items]
Net proceeds from sale of stock	$ 17,900
Sale of stock, number of shares issued in transaction (in shares)	16,210,602