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Fair Value Measurements - Valuation techniques and significant unobservable inputs used in recurring Level 3 fair value measurements of assets and liabilities (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
item
Fair Value Measurements    
Fair Value | $ $ 502,980 $ 514,265
Investments at fair value where valuation (unadjusted) is obtained from third-party pricing service | $ 2,257 5,262
2026 Notes    
Fair Value Measurements    
Estimated fair value of notes | $ 116,995  
Senior secured loans | Discounted cash flow | EBITDA multiples    
Fair Value Measurements    
Fair Value | $ $ 276,433 $ 305,252
Senior secured loans | Discounted cash flow | EBITDA multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.093 0.077
Senior secured loans | Discounted cash flow | EBITDA multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.038 0.050
Senior secured loans | Discounted cash flow | EBITDA multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.186 0.200
Senior secured loans | Discounted cash flow | EBITDA Market Yields | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.124 0.096
Senior secured loans | Discounted cash flow | EBITDA Market Yields | Minimum    
Fair Value Measurements    
Investments, measurement input 0.087 0.053
Senior secured loans | Discounted cash flow | EBITDA Market Yields | Maximum    
Fair Value Measurements    
Investments, measurement input 0.223 0.200
Senior secured loans | Discounted cash flow | Revenue Market Yields | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.134 0.084
Senior secured loans | Discounted cash flow | Revenue Market Yields | Minimum    
Fair Value Measurements    
Investments, measurement input 0.100 0.052
Senior secured loans | Discounted cash flow | Revenue Market Yields | Maximum    
Fair Value Measurements    
Investments, measurement input 0.220 0.131
Senior secured loans | Discounted cash flow | Revenue multiples    
Fair Value Measurements    
Fair Value | $ $ 130,199 $ 79,913
Senior secured loans | Discounted cash flow | Revenue multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.044 0.065
Senior secured loans | Discounted cash flow | Revenue multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.002 0.005
Senior secured loans | Discounted cash flow | Revenue multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.123 0.130
Senior secured loans | Enterprise value | EBITDA multiples    
Fair Value Measurements    
Fair Value | $ $ 80 $ 5,111
Senior secured loans | Enterprise value | EBITDA multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.080 0.065
Senior secured loans | Enterprise value | EBITDA multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.080 0.065
Senior secured loans | Enterprise value | EBITDA multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.080 0.065
Senior secured loans | Enterprise value | Revenue multiples    
Fair Value Measurements    
Fair Value | $ $ 5,706 $ 5,771
Senior secured loans | Enterprise value | Revenue multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.025 0.028
Senior secured loans | Enterprise value | Revenue multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.025 0.028
Senior secured loans | Enterprise value | Revenue multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.025 0.028
Senior secured loans | Enterprise value | Book value multiples    
Fair Value Measurements    
Fair Value | $ $ 19,546 $ 23,484
Senior secured loans | Enterprise value | Book value multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.012 0.015
Senior secured loans | Enterprise value | Book value multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.012 0.015
Senior secured loans | Enterprise value | Book value multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.012 0.015
Senior secured loans | Liquidation | Probability weighting of alternative outcomes    
Fair Value Measurements    
Fair Value | $ $ 1,488 $ 3,026
Senior secured loans | Liquidation | Probability weighting of alternative outcomes | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.713 0.882
Senior secured loans | Liquidation | Probability weighting of alternative outcomes | Minimum    
Fair Value Measurements    
Investments, measurement input 0.291 0.482
Senior secured loans | Liquidation | Probability weighting of alternative outcomes | Maximum    
Fair Value Measurements    
Investments, measurement input 1.000 1.000
Unitranche secured loans | Discounted cash flow | EBITDA multiples    
Fair Value Measurements    
Fair Value | $ $ 17,019 $ 45,072
Unitranche secured loans | Discounted cash flow | EBITDA multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.088 0.084
Unitranche secured loans | Discounted cash flow | EBITDA multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.088 0.055
Unitranche secured loans | Discounted cash flow | EBITDA multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.088 0.110
Unitranche secured loans | Discounted cash flow | EBITDA Market Yields | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.112 0.085
Unitranche secured loans | Discounted cash flow | EBITDA Market Yields | Minimum    
Fair Value Measurements    
Investments, measurement input 0.091 0.073
Unitranche secured loans | Discounted cash flow | EBITDA Market Yields | Maximum    
Fair Value Measurements    
Investments, measurement input 0.130 0.133
Unitranche secured loans | Discounted cash flow | Revenue Market Yields | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.119 0.083
Unitranche secured loans | Discounted cash flow | Revenue Market Yields | Minimum    
Fair Value Measurements    
Investments, measurement input 0.116 0.083
Unitranche secured loans | Discounted cash flow | Revenue Market Yields | Maximum    
Fair Value Measurements    
Investments, measurement input 0.121 0.083
Unitranche secured loans | Discounted cash flow | Revenue multiples    
Fair Value Measurements    
Fair Value | $ $ 3,614 $ 1,472
Unitranche secured loans | Discounted cash flow | Revenue multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.089 0.140
Unitranche secured loans | Discounted cash flow | Revenue multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.058 0.140
Unitranche secured loans | Discounted cash flow | Revenue multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.125 0.140
Unitranche secured loans | Enterprise value | Revenue multiples    
Fair Value Measurements    
Fair Value | $   $ 4,950
Unitranche secured loans | Enterprise value | Revenue multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input   0.006
Unitranche secured loans | Enterprise value | Revenue multiples | Minimum    
Fair Value Measurements    
Investments, measurement input   0.006
Unitranche secured loans | Enterprise value | Revenue multiples | Maximum    
Fair Value Measurements    
Investments, measurement input   0.006
Junior secured loans | Discounted cash flow | Market yields    
Fair Value Measurements    
Fair Value | $ $ 20,311 $ 12,266
Junior secured loans | Discounted cash flow | Market yields | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.136 0.158
Junior secured loans | Discounted cash flow | Market yields | Minimum    
Fair Value Measurements    
Investments, measurement input 0.123 0.080
Junior secured loans | Discounted cash flow | Market yields | Maximum    
Fair Value Measurements    
Investments, measurement input 0.204 0.251
Junior secured loans | Discounted cash flow | Revenue Market Yields | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input   0.020
Junior secured loans | Discounted cash flow | Revenue Market Yields | Minimum    
Fair Value Measurements    
Investments, measurement input   0.020
Junior secured loans | Discounted cash flow | Revenue Market Yields | Maximum    
Fair Value Measurements    
Investments, measurement input   0.020
Junior secured loans | Discounted cash flow | Revenue multiples    
Fair Value Measurements    
Fair Value | $   $ 1,522
Junior secured loans | Discounted cash flow | Revenue multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input   0.150
Junior secured loans | Discounted cash flow | Revenue multiples | Minimum    
Fair Value Measurements    
Investments, measurement input   0.150
Junior secured loans | Discounted cash flow | Revenue multiples | Maximum    
Fair Value Measurements    
Investments, measurement input   0.150
Junior secured loans | Liquidation | Probability weighting of alternative outcomes    
Fair Value Measurements    
Fair Value | $ $ 1,882 $ 576
Junior secured loans | Liquidation | Probability weighting of alternative outcomes | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 2.258 0.691
Junior secured loans | Liquidation | Probability weighting of alternative outcomes | Minimum    
Fair Value Measurements    
Investments, measurement input 2.258 0.691
Junior secured loans | Liquidation | Probability weighting of alternative outcomes | Maximum    
Fair Value Measurements    
Investments, measurement input 2.258 0.691
Equity securities | Discounted cash flow | EBITDA multiples    
Fair Value Measurements    
Fair Value | $ $ 397 $ 714
Equity securities | Discounted cash flow | EBITDA multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.070 0.133
Equity securities | Discounted cash flow | EBITDA multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.070 0.133
Equity securities | Discounted cash flow | EBITDA multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.070 0.133
Equity securities | Discounted cash flow | EBITDA Market Yields | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input   0.123
Equity securities | Discounted cash flow | EBITDA Market Yields | Minimum    
Fair Value Measurements    
Investments, measurement input   0.123
Equity securities | Discounted cash flow | EBITDA Market Yields | Maximum    
Fair Value Measurements    
Investments, measurement input   0.123
Equity securities | Enterprise value | EBITDA multiples    
Fair Value Measurements    
Fair Value | $ $ 16,630 $ 15,688
Equity securities | Enterprise value | EBITDA multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.090 0.056
Equity securities | Enterprise value | EBITDA multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.038 0.045
Equity securities | Enterprise value | EBITDA multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.160 0.151
Equity securities | Enterprise value | Revenue multiples    
Fair Value Measurements    
Fair Value | $ $ 7,502 $ 6,448
Equity securities | Enterprise value | Revenue multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.023 0.048
Equity securities | Enterprise value | Revenue multiples | Minimum    
Fair Value Measurements    
Investments, measurement input 0.002 0.006
Equity securities | Enterprise value | Revenue multiples | Maximum    
Fair Value Measurements    
Investments, measurement input 0.123 0.123
Equity securities | Enterprise value | Book value multiples    
Fair Value Measurements    
Fair Value | $   $ 264
Equity securities | Enterprise value | Book value multiples | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input   0.015
Equity securities | Enterprise value | Book value multiples | Minimum    
Fair Value Measurements    
Investments, measurement input   0.015
Equity securities | Enterprise value | Book value multiples | Maximum    
Fair Value Measurements    
Investments, measurement input   0.015
Equity securities | Liquidation | Probability weighting of alternative outcomes    
Fair Value Measurements    
Fair Value | $   $ 2,281
Equity securities | Liquidation | Probability weighting of alternative outcomes | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input   0.244
Equity securities | Liquidation | Probability weighting of alternative outcomes | Minimum    
Fair Value Measurements    
Investments, measurement input   0.244
Equity securities | Liquidation | Probability weighting of alternative outcomes | Maximum    
Fair Value Measurements    
Investments, measurement input   0.244
Equity securities | Option pricing model | Volatility    
Fair Value Measurements    
Fair Value | $ $ 2,173 $ 455
Equity securities | Option pricing model | Volatility | Weighted Average Mean    
Fair Value Measurements    
Investments, measurement input 0.666 0.425
Equity securities | Option pricing model | Volatility | Minimum    
Fair Value Measurements    
Investments, measurement input 0.494 0.425
Equity securities | Option pricing model | Volatility | Maximum    
Fair Value Measurements    
Investments, measurement input 0.700 0.425