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Organization and Description of Business	12 Months Ended
Organization and Description of Business	Dec. 31, 2024
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”) is a software company that orchestrates business processes. The Appian Platform empowers leaders to design, automate, and optimize important processes from start to finish. With our industry-leading platform and commitment to customer success, Appian is trusted by top organizations to drive transformational process change. We are headquartered in McLean, Virginia and operate both in the U.S. and internationally including Australia, Canada, France, Germany, India, Italy, Japan, Mexico, the Netherlands, Portugal, Singapore, Spain, Sweden, Switzerland, and the United Kingdom.