XML 38 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 28, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol ACAD    
Entity Registrant Name ACADIA PHARMACEUTICALS INC    
Entity Central Index Key 0001070494    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Common Stock, Shares Outstanding   155,339,667  
Entity Public Float     $ 2,200,000,000
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Entity File Number 000-50768    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code DE    
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    
Document Transition Report false    
Document Annual Report true    
Documents Incorporated by Reference Portions of the registrant’s definitive Proxy Statement to be filed with the Securities and Exchange Commission by April 29, 2020 are incorporated by reference into Part III of this report.