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Subsequent Event - Summary of Milestone Payments based on the achievement of certain Development and Sales Milestones (Details) - Subsequent Event [Member] $ in Thousands	Jul. 31, 2023 USD ($)
Trofinetide [Member]
Subsequent Event [Line Items]
Development milestones	$ 0
Total milestone payments	426,250
NNZ-2591 [Member]
Subsequent Event [Line Items]
Development milestones	15,000
Total milestone payments	831,250
North America [Member] | First commercial sale milestones [Member] | Trofinetide [Member]
Subsequent Event [Line Items]
Total milestone payments	0
North America [Member] | First commercial sale milestones [Member] | NNZ-2591 [Member]
Subsequent Event [Line Items]
Total milestone payments	40,000
North America [Member] | Sales Milestone [Member] | Trofinetide [Member]
Subsequent Event [Line Items]
Total milestone payments	0
North America [Member] | Sales Milestone [Member] | NNZ-2591 [Member]
Subsequent Event [Line Items]
Total milestone payments	350,000
Europe [Member] | First commercial sale milestones [Member] | Trofinetide [Member]
Subsequent Event [Line Items]
Total milestone payments	45,000
Europe [Member] | First commercial sale milestones [Member] | NNZ-2591 [Member]
Subsequent Event [Line Items]
Total milestone payments	45,000
Europe [Member] | Sales Milestone [Member] | Trofinetide [Member]
Subsequent Event [Line Items]
Total milestone payments	170,000
Europe [Member] | Sales Milestone [Member] | NNZ-2591 [Member]
Subsequent Event [Line Items]
Total milestone payments	170,000
Rest of World [Member] | Sales Milestone [Member] | Trofinetide [Member]
Subsequent Event [Line Items]
Total milestone payments	82,500
Rest of World [Member] | Sales Milestone [Member] | NNZ-2591 [Member]
Subsequent Event [Line Items]
Total milestone payments	82,500
JAPAN | First commercial sale milestones [Member] | Trofinetide [Member]
Subsequent Event [Line Items]
Total milestone payments	18,750
JAPAN | First commercial sale milestones [Member] | NNZ-2591 [Member]
Subsequent Event [Line Items]
Total milestone payments	18,750
JAPAN | Sales Milestone [Member] | Trofinetide [Member]
Subsequent Event [Line Items]
Total milestone payments	110,000
JAPAN | Sales Milestone [Member] | NNZ-2591 [Member]
Subsequent Event [Line Items]
Total milestone payments	$ 110,000

X

- Definition

Development milestones

+ References

No definition available.

+ Details

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Namespace Prefix:	acad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

+ 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:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

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- Details

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Namespace Prefix:
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Period Type:

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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