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Consolidated Entities - Summary of individual investments held by ISP Fund (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Common stock - Publicly traded healthcare companies
Common stock	$ 626	$ 633
Preferred stocks - Privately held healthcare companies
Preferred stock	0	0
Isp Fund Lp [Member]
Preferred stocks - Privately held healthcare companies
Money market fund and cash	84,198	63,339
Total investments held by ISP Fund LP	252,307	311,812
Isp Fund Lp [Member] | Publicly Held Healthcare Companies
Common stock - Publicly traded healthcare companies
Common stock	106,525	187,868
Isp Fund Lp [Member] | Privately Held Healthcare Companies
Preferred stocks - Privately held healthcare companies
Warrants	7,926	8,075
United States | Publicly Held Healthcare Companies
Common stock - Publicly traded healthcare companies
Common stock	103,942
United States | Isp Fund Lp [Member] | Publicly Held Healthcare Companies
Common stock - Publicly traded healthcare companies
Common stock		184,926
United States | Isp Fund Lp [Member] | Privately Held Healthcare Companies
Preferred stocks - Privately held healthcare companies
Preferred stock	53,658	52,530
United Kingdom | Isp Fund Lp [Member] | Publicly Held Healthcare Companies
Common stock - Publicly traded healthcare companies
Common stock	$ 2,583	$ 2,942

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