Organization	12 Months Ended
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Note 1 — Organization Runway Growth Finance Corp. (formerly known as Runway Growth Credit Fund Inc.) (the "Company"), is a Maryland corporation that was formed on August 31, 2015. On August 18, 2021, the Company changed its name to "Runway Growth Finance Corp." from "Runway Growth Credit Fund Inc." The Company is an externally managed, non-diversified, closed-end investment company that has elected to be regulated as a business development company ("BDC") under the Investment Company Act of 1940, as amended (the "1940 Act"). In addition, the Company has elected to be treated, currently qualifies, and intends to continue to qualify annually, as a regulated investment company ("RIC") under Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"). The Company was formed primarily to lend to, and selectively invest in, high growth-potential companies in technology, life sciences, healthcare information and services, business services, financial services, select consumer services and products in other high-growth industries in the United States. The Company’s investment objective is to maximize its total return to its stockholders primarily through current income on its loan portfolio, and secondarily through capital gain (loss) on its warrants and other equity positions. The Company’s investment activities are managed by its external investment adviser, Runway Growth Capital LLC ("RGC"). The Company’s administrator, Runway Administrator Services LLC (the "Administrator") is a wholly owned subsidiary of RGC and provides administrative services necessary for the Company to operate. On October 25, 2021, the Company closed its initial public offering ("IPO"), issuing 6,850,000 shares of its common stock at a public offering price of $14.60 per share. Net of underwriting fees and offering costs, the Company received net proceeds of $93.0 million. The Company's common stock began trading on the Nasdaq Global Select Market LLC on October 21, 2021 under the symbol “RWAY”.

Organization

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Note 1 — Organization

Runway Growth Finance Corp. (formerly known as Runway Growth Credit Fund Inc.) (the "Company"), is a Maryland corporation that was formed on August 31, 2015. On August 18, 2021, the Company changed its name to "Runway Growth Finance Corp." from "Runway Growth Credit Fund Inc." The Company is an externally managed, non-diversified, closed-end investment company that has elected to be regulated as a business development company ("BDC") under the Investment Company Act of 1940, as amended (the "1940 Act"). In addition, the Company has elected to be treated, currently qualifies, and intends to continue to qualify annually, as a regulated investment company ("RIC") under Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code").

The Company was formed primarily to lend to, and selectively invest in, high growth-potential companies in technology, life sciences, healthcare information and services, business services, financial services, select consumer services and products in other high-growth industries in the United States. The Company’s investment objective is to maximize its total return to its stockholders primarily through current income on its loan portfolio, and secondarily through capital gain (loss) on its warrants and other equity positions. The Company’s investment activities are managed by its external investment adviser, Runway Growth Capital LLC ("RGC"). The Company’s administrator, Runway Administrator Services LLC (the "Administrator") is a wholly owned subsidiary of RGC and provides administrative services necessary for the Company to operate.

On October 25, 2021, the Company closed its initial public offering ("IPO"), issuing 6,850,000 shares of its common stock at a public offering price of $14.60 per share. Net of underwriting fees and offering costs, the Company received net proceeds of $93.0 million. The Company's common stock began trading on the Nasdaq Global Select Market LLC on October 21, 2021 under the symbol “RWAY”.