Commitments and Contingencies - Schedule of Unfunded Commitments to Extend Financing (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	$ 201,520	$ 315,685
3PL Central LLC (dba Extensiv) | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	11,500	15,000
Betterment Holdings, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	5,000
Blueshift Labs, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	14,500
Bombora, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	2,000
Brivo, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	6,000	16,000
CloudPay, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing		15,000
Dtex Systems, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing		15,000
EBR Systems, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	10,000	30,000
Intellisite Holdings, Inc. (dba Epic IO Technologies, Inc.) | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing		6,000
Interactions Corporation | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	10,000	10,000
Kin Insurance, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing		25,000
Linxup, LLC | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	7,500
Madison Reed, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	1,200	2,400
Moximed, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	15,000	15,000
Nalu Medical, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	15,000	25,000
Revelle Aesthetics, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing		12,500
Route 92 Medical, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	20,000	42,000
SetPoint Medical Corporation | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	40,000	40,000
Skillshare, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	10,000	15,000
Snagajob.com, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	6,785	6,785
Snagajob.com, Inc. | Convertible Note
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	2,035
Synack, Inc. | Senior Secured Term Loan
Schedule Of Investments [Line Items]
Total unused commitments to extend financing	$ 25,000	$ 25,000