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Organization and Business	12 Months Ended
Organization and Business	Dec. 31, 2016
Accounting Policies [Abstract]
Organization and Business	1. Organization and Business ACADIA Pharmaceuticals Inc. (the “Company”), based in San Diego, California, is a biopharmaceutical company focused on the development and commercialization of innovative medicines to address unmet medical needs in central nervous system disorders. The Company was originally incorporated in Vermont in 1993 as Receptor Technologies, Inc. and reincorporated in Delaware in 1997. On April 29, 2016, the U.S. Food and Drug Administration (“FDA”) approved the Company’s first drug, NUPLAZID (pimavanserin), for the treatment of hallucinations and delusions associated with Parkinson’s disease psychosis (“PD Psychosis”). The Company commenced commercial sales of the product in the United States in May 2016. Accordingly, the Company’s financial statements for 2016 include product revenue and other transactions related to the commercialization of NUPLAZID that did not exist in prior years.