Commitments and Contingencies - Unfunded Commitments (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	$ 70,627,000	$ 67,054,000	$ 50,716,000
Fair Value of Unfunded Commitment Liability	1,064,000	940,000
Backlog amount	0	0	$ 0
Investment, Identifier [Axis]: Activehours, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	10,000,000	10,000,000
Fair Value of Unfunded Commitment Liability	41,000	41,000
Investment, Identifier [Axis]: Ao1 Holdings, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	2,280,000	2,280,000
Fair Value of Unfunded Commitment Liability	34,000	34,000
Investment, Identifier [Axis]: Cresta Intelligence, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	5,000,000	5,000,000
Fair Value of Unfunded Commitment Liability	16,000	16,000
Investment, Identifier [Axis]: Earth Funeral Group, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	5,000,000	0
Fair Value of Unfunded Commitment Liability	112,000	0
Investment, Identifier [Axis]: Encore Music Technologies, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	0	0
Fair Value of Unfunded Commitment Liability	2,000	2,000
Investment, Identifier [Axis]: Ephemeral Solutions, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	0	0
Fair Value of Unfunded Commitment Liability	0	1,000
Investment, Identifier [Axis]: Eridu Corporation
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	7,000,000	0
Fair Value of Unfunded Commitment Liability	110,000	0
Investment, Identifier [Axis]: Etched.ai, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	10,000,000	10,000,000
Fair Value of Unfunded Commitment Liability	350,000	350,000
Investment, Identifier [Axis]: Flashparking, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	250,000	250,000
Fair Value of Unfunded Commitment Liability	1,000	1,000
Investment, Identifier [Axis]: Haven Energy Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	0	2,700,000
Fair Value of Unfunded Commitment Liability	0	67,000
Investment, Identifier [Axis]: Hermeus Corporation
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	2,272,000	3,212,000
Fair Value of Unfunded Commitment Liability	26,000	36,000
Investment, Identifier [Axis]: Hover Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	1,000,000	1,000,000
Fair Value of Unfunded Commitment Liability	14,000	14,000
Investment, Identifier [Axis]: Hydrow Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	439,000	324,000
Fair Value of Unfunded Commitment Liability	0	0
Investment, Identifier [Axis]: Join Digital, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	0	2,100,000
Fair Value of Unfunded Commitment Liability	0	41,000
Investment, Identifier [Axis]: Karat Financial Technologies, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	0	6,719,000
Fair Value of Unfunded Commitment Liability	0	84,000
Investment, Identifier [Axis]: Luxury Presence, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	5,500,000	5,500,000
Fair Value of Unfunded Commitment Liability	47,000	47,000
Investment, Identifier [Axis]: Mirelo AI GmbH
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	449,000	862,000
Fair Value of Unfunded Commitment Liability	10,000	17,000
Investment, Identifier [Axis]: Muon Space, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	5,000,000	5,000,000
Fair Value of Unfunded Commitment Liability	78,000	78,000
Investment, Identifier [Axis]: Ocrolus Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	1,714,000	1,714,000
Fair Value of Unfunded Commitment Liability	22,000	22,000
Investment, Identifier [Axis]: Overtime Sports, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	0	1,143,000
Fair Value of Unfunded Commitment Liability	0	8,000
Investment, Identifier [Axis]: Panorama Education, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	190,000	2,140,000
Fair Value of Unfunded Commitment Liability	2,000	2,000
Investment, Identifier [Axis]: Planet A Foods GmbH
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	1,248,000	1,198,000
Fair Value of Unfunded Commitment Liability	25,000	24,000
Investment, Identifier [Axis]: Quantum Circuits, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	1,000,000	1,000,000
Fair Value of Unfunded Commitment Liability	10,000	10,000
Investment, Identifier [Axis]: Thoughtful Automation, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	4,061,000	4,061,000
Fair Value of Unfunded Commitment Liability	39,000	39,000
Investment, Identifier [Axis]: Thoughtspot, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	7,000,000	0
Fair Value of Unfunded Commitment Liability	119,000	0
Investment, Identifier [Axis]: Workmate Labs, Inc.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	500,000	500,000
Fair Value of Unfunded Commitment Liability	2,000	2,000
Investment, Identifier [Axis]: Worldwide Freight Logistics Ltd.
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded Commitments	724,000	351,000
Fair Value of Unfunded Commitment Liability	$ 4,000	$ 4,000