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Fair value measurement - Changes in estimated fair value of contingent cash award (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Fair Value Disclosures [Abstract]
Balance as of December 31, 2022	$ 898
Vesting of awards	772
Expense forfeited	(128)
Change in fair value	2,964
Balance as of December 31, 2023	$ 4,506

X

- Definition

Fair value measurement with unobservable inputs reconciliations recurring basis liability expense forfeited.

+ References

No definition available.

+ Details

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X

- Definition

Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Vesting of Awards

+ References

No definition available.

+ Details

Name:	acad_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityVestingOfAwards
Namespace Prefix:	acad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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