| Component: (Network and Table) | |
|---|---|
| Network | 100290 - Disclosure - Summary of Significant Accounting Policies - Assumptions Used to Estimate Fair Value of Employee Stock Options (Detail) (http://www.acadia-pharm.com/20161231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAssumptionsUsedToEstimateFairValueOfEmployeeStockOptionsDetail) |
| Table | Assumptions Used To Determine Fair Value Options [Table] |
| Reporting Entity [Axis] | 0001070494 (http://www.sec.gov/CIK) |
| Option Indexed to Issuer's Equity | Stock Options |
| Assumptions used to Determine Fair Value Options [Line Items] | Period [Axis] | ||
|---|---|---|---|
2016-01-01 - 2016-12-31 | 2015-01-01 - 2015-12-31 | 2014-01-01 - 2014-12-31 | |
Expected volatility | |||
Risk-free interest rate, minimum | |||
Risk-free interest rate, maximum | |||
Expected dividend yield | |||
Expected life of options in years | |||