Related Party Agreements and Transactions - Schedule of Unfunded Commitments and Capital Contributions (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 07, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Unfunded loan commitments	$ 235,820		$ 201,520
Joint Venture
Related Party Transaction [Line Items]
Unfunded loan commitments	35,000		$ 0
Joint Venture | Runway-Cadma I LLC
Related Party Transaction [Line Items]
Unfunded loan commitments		$ 35,000
Joint Venture | Runway Growth Finance Corp
Related Party Transaction [Line Items]
Unfunded loan commitments	35,000
Joint Venture | All Members
Related Party Transaction [Line Items]
Unfunded loan commitments	$ 70,000