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Organization and Description of Business	12 Months Ended
Organization and Description of Business	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	1. Organization and Description of Business Appian Corporation (together with its subsidiaries, “Appian,” the “Company,” “we,” or “our”) provides process automation technology. For over 25 years, our highly reliable and scalable platform has been leveraged by large enterprises and governments. Combining leading edge process orchestration and intelligence, we provide everything an organization needs to design, automate, and optimize critical processes, facilitating continuous adaptation in changing environments. We are headquartered in McLean, Virginia and operate in the United States, and internationally including Australia, Canada, France, Germany, India, Italy, Japan, Mexico, the Netherlands, Portugal, Singapore, Spain, Sweden, Switzerland, and the United Kingdom.