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Subsequent Event - Additional Information (Detail) - Corporate Office Space Lease Agreement $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Feb. 24, 2020 USD ($) ft² | Dec. 31, 2018 USD ($)
Subsequent Event [Line Items] |  |  |
Operating leases arrangement term |  |  | 10 years 9 months
CALIFORNIA |  |  |
Subsequent Event [Line Items] |  |  |
Minimum lease payment amount |  |  | $ 53.7
Lease commencement period | third quarter of 2020 |  |
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Operating leases arrangement term |  | 10 years 7 months |
Subsequent Event | CALIFORNIA |  |  |
Subsequent Event [Line Items] |  |  |
Office space leases in square feet | ft² |  | 31,608 |
Minimum lease payment amount |  | $ 25.3 |

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- Definition Lessee operating lease lease not yet commenced minimum lease payments. + References No definition available. + Details
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Namespace Prefix: | acad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Area of land subject to a ground lease. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Description of lessee's operating lease that has not yet commenced. Including, but not limited to, nature of involvement with construction or design of underlying asset for lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
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Period Type: |

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- Details
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