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Document and Entity Information
Jul. 20, 2020
Cover [Abstract]  
Entity Registrant Name ACADIA PHARMACEUTICALS INC
Amendment Flag false
Entity Central Index Key 0001070494
Document Type 8-K
Document Period End Date Jul. 20, 2020
Entity Incorporation State Country Code DE
Entity File Number 000-50768
Entity Tax Identification Number 06-1376651
Entity Address, Address Line One 3611 Valley Centre Drive
Entity Address, Address Line Two Suite 300
Entity Address, City or Town San Diego
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92130
City Area Code (858)
Local Phone Number 558-2871
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.0001 per share
Trading Symbol ACAD
Security Exchange Name NASDAQ
Entity Emerging Growth Company false