Investment Valuations and Fair Value Measurements - Summary of Major Security Type of Fair Valuations (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	$ 166,550	$ 157,292
Cash Equivalents
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	4,735	4,676
Debt
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	132,238	118,178
Short-term Investments
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	29,577	34,438
Fair Value, Inputs, Level 1 [Member]
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	34,312	39,114
Fair Value, Inputs, Level 1 [Member] | Cash Equivalents
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	4,735	4,676
Fair Value, Inputs, Level 1 [Member] | Debt
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Short-term Investments
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	29,577	34,438
Fair Value, Inputs, Level 2 [Member]
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Cash Equivalents
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Debt
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Short-term Investments
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member]
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	132,238	118,178
Fair Value, Inputs, Level 3 [Member] | Cash Equivalents
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Debt
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	132,238	118,178
Fair Value, Inputs, Level 3 [Member] | Short-term Investments
Investment Valuations And Fair Value Measurements [Line Items]
Investment, Fair Value	$ 0	$ 0