Commitments and Contingencies - Schedule of Commitments To Fund Investments In Current Portfolio Companies (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Total Portfolio Company Commitments	[1],[2]	$ 327,154	$ 338,043
Alaska Bidco Oy | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		221
Alpha Midco Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		630	910
American Achievement Corp | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		2,403	2,403
Arrow Buyer, Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		7,645
ASG II, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		4,307	6,952
Avalara, Inc | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		3,864	3,864
Axonify, Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		4,193	6,113
Banyan Software Holdings, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		20,000
Bayshore Intermediate #2, LP | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		1,918	1,618
BCTO Ace Purchaser, Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		1,733	6,556
BCTO Bluebill Buyer, Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		5,586
Bear OpCo, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		1,543	2,606
BlueSnap, Inc. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		2,500	2,500
BTRS Holdings, Inc. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		7,239	8,638
Carlstar Group, LLC | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		8,500	8,500
Cordance Operations, LLC | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		3,494	12,093
Coupa Holdings, LLC | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		6,809
CrunchTime Information Systems, Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		154	7,101
Disco Parent, Inc. | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		455
Dye & Durham Corp. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		2,015	6,280
EDB Parent, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		13,142	18,037
Edge Bidco B.V. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		1,312
Elysian Finco Ltd. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		5,180	6,792
Employment Hero Holdings Pty Ltd. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		8,390	8,816
EMS Linq, Inc. | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		8,784	8,784
Erling Lux Bidco SARL | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		3,052	5,618
ExtraHop Networks Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		11,838	17,050
ForeScout Technologies, Inc. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		3,425	3,425
G Treasury SS, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments			3,400
Galileo Parent, Inc. | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		5,625
Hirevue, Inc. | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		6,887
Hornetsecurity Holding GmbH | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		2,025	2,041
Ibis Intermediate Co. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		6,338	6,338
IRGSE Holding Corp. | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		248	253
Kyriba Corp. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		45	45
Laramie Energy, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		7,683
LeanTaaS Holdings, Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		39,587	47,218
Lithium Technologies, LLC | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments			1,979
Lucidworks, Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		833	833
Marcura Equities LTD | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		11,667
Murchison Oil and Gas, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		3,257	9,772
Netwrix Corp. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		12,568	13,881
Neuintel, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments			4,200
OutSystems Luxco SARL | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		2,120	2,137
PageUp People, Ltd. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments			5,764
Passport Labs, Inc. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		2,778	2,778
Ping Identity Holding Corp | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		2,273	2,273
PrimePay Intermediate, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments			2,474
PrimeRevenue, Inc. | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		6,250	6,250
Project44, Inc. | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		19,861	19,861
Rapid Data GmbH Unternehmensberatung | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		5,994
ReliaQuest Holdings, LLC | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		10,009	22,752
SkyLark UK DebtCo | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		12,186
SL Buyer Corp | Delayed Draw
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		13,175
Tango Management Consulting, LLC | Delayed Draw & Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		13,989	26,576
TRP Assets, LLC | Delayed Draw and Membership Interest
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		1,000	7,806
WideOrbit, Inc. | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments			$ 4,756
Wrangler TopCo, LLC | Revolver
Loss Contingencies [Line Items]
Total Portfolio Company Commitments		$ 424

[1] Represents the full amount of the Company’s commitments to fund investments on such date. Commitments may be subject to limitations on borrowings set forth in the agreements between the Company and the applicable portfolio company. As a result, portfolio companies may not be eligible to borrow the full commitment amount on such date.

[2] The Company’s estimate of the fair value of the current investments in these portfolio companies includes an analysis of the fair value of any unfunded commitments.