v3.25.2
Cover
Jul. 15, 2025
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 15, 2025
Entity File Number 814-01180
Entity Registrant Name Runway Growth Finance Corp.
Entity Central Index Key 0001653384
Entity Tax Identification Number 47-5049745
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 205 N. Michigan Ave.
Entity Address, Address Line Two Suite 4200
Entity Address, City or Town Chicago
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60601
City Area Code 312
Local Phone Number 698-6902
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Common Stock Par Value 0. 01 Per Share [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol RWAY
Security Exchange Name NASDAQ
Sec 7. 50 Notes Due 2027 [Member]  
Document Information [Line Items]  
Title of 12(b) Security 7.50% Notes due 2027
Trading Symbol RWAYL
Security Exchange Name NASDAQ
Notes 8. 00 Due 2027 [Member]  
Document Information [Line Items]  
Title of 12(b) Security 8.00% Notes due 2027
Trading Symbol RWAYZ
Security Exchange Name NASDAQ