Organization and Description of Business	3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Mirum Pharmaceuticals, Inc. (the “Company”) was incorporated in the State of Delaware on May 2, 2018, and is headquartered in Foster City, California. The Company is a biopharmaceutical company dedicated to transforming the treatment of rare diseases. The Company has three approved medicines: LIVMARLI® (maralixibat) (“Livmarli”), Cholbam® (cholic acid) capsules (“Cholbam”), and Chenodal® or CTEXLI® (chenodiol) tablets (“Chenodal” or “Ctexli”). Livmarli is approved for the treatment of cholestatic pruritus in patients with Alagille syndrome (“ALGS”) in the United States (“U.S.”), the European Union (“EU”) and various other countries around the world and for cholestatic pruritus in patients with primary familial intrahepatic cholestasis (“PFIC”) in the U.S. and for the treatment of PFIC in the EU. Cholbam is FDA-approved for the treatment of bile acid synthesis disorders due to single enzyme deficiencies and adjunctive treatment of peroxisomal disorders in patients who show signs or symptoms of liver disease. In February 2025, the Company received FDA approval for chenodiol tablets for the treatment of CTX in adults, which will be commercialized under the brand name Ctexli. Prior to the approval of Ctexli, chenodiol tablets were commercialized under the brand name Chenodal under a medical necessity recognition from the FDA. Cholbam, Ctexli and Chenodal, collectively, are referred to as the “Bile Acid Medicines”. The Company’s development pipeline consists of the clinical-stage product candidate volixibat, MRM-3379 and indication expansion opportunities for Livmarli. The Company commenced significant operations in November 2018. The Company views its operations and manages its business as one operating segment and has determined its operating segment on the same basis that it uses to evaluate its performance internally. Liquidity The Company has a limited operating history, has incurred significant operating losses since its inception, and the revenue and income potential of the Company’s business and market are unproven. As of March 31, 2025, the Company had an accumulated deficit of $658.9 million and unrestricted cash, cash equivalents and investments of $298.6 million. The Company’s convertible notes are convertible at the option of the holders during the second quarter of 2025. If holders of the convertible notes elect to convert, the Company may elect to settle such conversions in cash, common stock or a combination of the two. The Company believes that its unrestricted cash, cash equivalents and investments of $298.6 million as of March 31, 2025, provide sufficient capital resources to continue its operations for at least twelve months from the issuance date of the accompanying unaudited condensed consolidated financial statements.

Mirum Pharmaceuticals, Inc. (the “Company”) was incorporated in the State of Delaware on May 2, 2018, and is headquartered in Foster City, California. The Company is a biopharmaceutical company dedicated to transforming the treatment of rare diseases.

The Company has three approved medicines: LIVMARLI® (maralixibat) (“Livmarli”), Cholbam® (cholic acid) capsules (“Cholbam”), and Chenodal® or CTEXLI® (chenodiol) tablets (“Chenodal” or “Ctexli”).

Livmarli is approved for the treatment of cholestatic pruritus in patients with Alagille syndrome (“ALGS”) in the United States (“U.S.”), the European Union (“EU”) and various other countries around the world and for cholestatic pruritus in patients with primary familial intrahepatic cholestasis (“PFIC”) in the U.S. and for the treatment of PFIC in the EU.

Cholbam is FDA-approved for the treatment of bile acid synthesis disorders due to single enzyme deficiencies and adjunctive treatment of peroxisomal disorders in patients who show signs or symptoms of liver disease. In February 2025, the Company received FDA approval for chenodiol tablets for the treatment of CTX in adults, which will be commercialized under the brand name Ctexli. Prior to the approval of Ctexli, chenodiol tablets were commercialized under the brand name Chenodal under a medical necessity recognition from the FDA. Cholbam, Ctexli and Chenodal, collectively, are referred to as the “Bile Acid Medicines”.

The Company commenced significant operations in November 2018. The Company views its operations and manages its business as one operating segment and has determined its operating segment on the same basis that it uses to evaluate its performance internally.

The Company has a limited operating history, has incurred significant operating losses since its inception, and the revenue and income potential of the Company’s business and market are unproven. As of March 31, 2025, the Company had an accumulated deficit of $658.9 million and unrestricted cash, cash equivalents and investments of $298.6 million. The Company’s convertible notes are convertible at the option of the holders during the second quarter of 2025. If holders of the convertible notes elect to convert, the Company may elect to settle such conversions in cash, common stock or a combination of the two. The Company believes that its unrestricted cash, cash equivalents and investments of $298.6 million as of March 31, 2025, provide sufficient capital resources to continue its operations for at least twelve months from the issuance date of the accompanying unaudited condensed consolidated financial statements.