v2.4.0.8
Document and Entity Information
3 Months Ended
Mar. 31, 2015
Apr. 30, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Trading Symbol ACAD  
Entity Registrant Name ACADIA PHARMACEUTICALS INC  
Entity Central Index Key 0001070494  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   100,297,426