Beneficial ownership percentage.

No definition available.

Name:	axsm_BeneficialOwnershipPercentage
Namespace Prefix:	axsm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of net sales of products containing the licensed products, due to licensor as a royalty.

+ References

No definition available.

+ Details

Name:	axsm_LicenseAgreementRoyaltyDuePercentageOfNetSales
Namespace Prefix:	axsm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of license agreements the Company has entered into.

+ References

No definition available.

+ Details

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Namespace Prefix:	axsm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

+ References

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-SubTopic 10
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of new stock issued during the period.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Details

Name:	srt_CounterpartyNameAxis=axsm_AuvelityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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Related-Party Transactions - Additional Information (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2012 shares	Dec. 31, 2024 USD ($) Item	Dec. 31, 2023 USD ($)	Dec. 31, 2012 Item
Antecip
Related Party Transaction [Line Items]
Shares issued \| shares	7,344,500
Antecip \| License Agreement
Related Party Transaction [Line Items]
Royalty expense \| $		$ 8.7	$ 3.9
License agreement royalty as a percent of net sales		3.00%
Number of exclusive license agreements \| Item		3		3
Auvelity
Related Party Transaction [Line Items]
License agreement royalty as a percent of net sales		3.00%
Auvelity \| Antecip \| License Agreement
Related Party Transaction [Line Items]
License agreement royalty as a percent of net sales			3.00%
Minimum \| Dr. Tabuteau
Related Party Transaction [Line Items]
Beneficial ownership percentage		5.00%