Related Party Transactions - Investments in DSTs, Capital Acquisitions Partners, LLC (Details) - USD ($) $ in Millions	Jan. 02, 2025	Sep. 11, 2024	Jul. 26, 2024	Jun. 30, 2025
Capital Acquisitions Partners, LLC | Capital Acquisitions Partners, LLC
Related Party Transaction [Line Items]
Ownership percentage				20.90%
NexPoint Life Science II DST
Related Party Transaction [Line Items]
Stock issued during period, investment value, purchase of common shares			$ 4.6
NexPoint Semiconductor Manufacturing DST
Related Party Transaction [Line Items]
Stock issued during period, investment value, purchase of common shares			$ 14.9
Number of values acquired	$ 3.0	$ 6.1