XML 17 R1.htm IDEA: XBRL DOCUMENT v3.25.0.1
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 17, 2025
Jun. 30, 2024
Document and Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38098    
Entity Registrant Name APPIAN CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 54-1956084    
Entity Address, Address Line One 7950 Jones Branch Drive    
Entity Address, City or Town McLean    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 22102    
City Area Code (703)    
Local Phone Number 442-8844    
Title of 12(b) Security Class A Common Stock    
Trading Symbol APPN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Documents Incorporated by Reference Portions of the registrant's definitive Proxy Statement for its 2025 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K are incorporated by reference in Part III, Items 10-14 of this Annual Report on Form 10-K.    
Entity Central Index Key 0001441683    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Class A Common Stock      
Document and Entity Information [Line Items]      
Entity Public Float     $ 909.8
Entity Common Stock, Shares Outstanding   42,957,026  
Class B Common Stock      
Document and Entity Information [Line Items]      
Entity Public Float     $ 63.8
Entity Common Stock, Shares Outstanding   31,088,085