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Cover
Feb. 16, 2023
Cover [Abstract]  
Document Type 8-K
Document Period End Date Feb. 16, 2023
Entity Registrant Name Appian Corporation
Entity Incorporation, State or Country Code DE
Entity File Number 001-38098
Entity Tax Identification Number 54-1956084
Entity Address, State or Province VA
Entity Address, City or Town McLean
Entity Address, Address Line One 7950 Jones Branch Drive
Entity Address, Postal Zip Code 22102
City Area Code 703
Local Phone Number 442-8844
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Class A Common Stock
Trading Symbol APPN
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001441683