Description of Business	12 Months Ended
Description of Business	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Arcutis Biotherapeutics, Inc. (the Company) is a commercial-stage biopharmaceutical company focused on developing and commercializing treatments for dermatological diseases with high unmet medical needs. The Company’s strategy is to focus on validated biological targets and to use its drug development platform and deep dermatology expertise to develop differentiated products that have the potential to address the major shortcomings of existing therapies in its targeted indications. The Company received U.S. Food and Drug Administration (FDA) approval of its first product, ZORYVE® (roflumilast) cream 0.3% (ZORYVE cream 0.3%), in July 2022, for the treatment of plaque psoriasis, including intertriginous psoriasis, in individuals 12 years of age and older (subsequently approved down to 6 years old in October 2023), and began U.S. commercialization in August 2022. The Company also received Health Canada approval of ZORYVE cream 0.3% in plaque psoriasis in April 2023 and began Canadian commercialization in June 2023. The Company received FDA approval of ZORYVE® (roflumilast) topical foam 0.3% (ZORYVE foam), in December 2023, for the treatment of seborrheic dermatitis in individuals 9 years of age and older, and began U.S. commercialization in January 2024. The Company received FDA approval of ZORYVE® (roflumilast) cream 0.15% (ZORYVE cream 0.15%) and began U.S. commercialization, in July 2024, for the topical treatment of mild to moderate atopic dermatitis in adult and pediatric patients 6 years of age and older. The Company received Health Canada approval of ZORYVE foam for seborrheic dermatitis in October 2024, and began Canadian commercialization in December 2024. The Company received Health Canada approval for ZORYVE cream 0.15% for atopic dermatitis in March 2025, and began Canadian commercialization in April 2025. The Company also received FDA approval of ZORYVE foam 0.3% for the treatment of plaque psoriasis of the scalp and body in adult and adolescents 12 years of age and older in May 2025, and began U.S. commercialization in June 2025. The Company received FDA approval of ZORYVE® (roflumilast) cream 0.05% (ZORYVE cream 0.05%) in October 2025 and began commercialization for the topical treatment of mild to moderate atopic dermatitis in children ages 2 to 5 years of age. The Company received Health Canada approval for ZORYVE foam 0.3% for the treatment of plaque psoriasis of the scalp and body in adult and adolescents 12 years of age and older in October 2025, and began Canadian commercialization in November 2025. The Company has incurred significant annual losses and negative cash flows from operations since its inception and had an accumulated deficit of $1,138.1 million and $1,121.9 million as of December 31, 2025 and 2024, respectively. The Company may continue to incur operating losses. The Company had cash, cash equivalents, restricted cash, and marketable securities of $221.3 million and $228.6 million as of December 31, 2025 and 2024, respectively. The Company had $100.0 million outstanding under the Loan Agreement as of December 31, 2025. The Company believes that its existing capital resources will be sufficient to meet the projected operating requirements for at least 12 months from the date of issuance of its financial statements. If the Company's available cash, cash equivalents and marketable securities and anticipated future cash flows from operations are insufficient to satisfy its liquidity requirements, the Company may need to raise additional capital to fund its operations. No assurance can be given as to whether additional financing will be available on terms acceptable to the Company or at all. If sufficient funds on acceptable terms are not available when needed, the Company may be required to curtail certain planned activities. Failure to manage discretionary spending or raise additional funds, as needed, may adversely impact the Company’s ability to achieve its intended business objectives and have an adverse effect on its results of operations and future prospects.