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Subsequent Events (Details) - Subsequent Event - License agreement - Kaken Pharmaceutical, Co., Ltd $ in Millions | Aug. 06, 2025 USD ($)
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Subsequent Events |
Receivable license payment | $ 16.0
Commercialization and sales milestone | $ 16.0
Percentage royalty rate | 30.00%
Royalty payments term | 10 years
Termination license agreement | 30 days
Termination license agreement period | 90 days

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- Definition Number of days notice pursuant to termination of agreement. + References No definition available. + Details
Name: | atxs_AgreementTerminationNoticePeriod
Namespace Prefix: | atxs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of days notice for material safety issue pursuant to termination of agreement. + References No definition available. + Details
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Namespace Prefix: | atxs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of additional commercialization and sales milestone payment receivable under the agreement. + References No definition available. + Details
Name: | atxs_CommercializationAndSalesMilestonePaymentReceivable
Namespace Prefix: | atxs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Denotes the duration of royalty payments from the first commercial sale of the product. + References No definition available. + Details
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Namespace Prefix: | atxs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum royalties to be received as a percentage of net sales. + References No definition available. + Details
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Namespace Prefix: | atxs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of upfront license fees to be received. + References No definition available. + Details
Name: | atxs_UpfrontLicensePaymentReceivable
Namespace Prefix: | atxs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 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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Balance Type: | na
Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | srt_CounterpartyNameAxis=atxs_KakenPharmaceuticalCo.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |