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Summary of Significant Accounting Polices - Fair Value of Financial Instruments (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value of Financial Instruments |  |
Fair value assets, transfers from Level 1 to Level 2 | $ 0 | $ 0
Fair value assets, transfers from Level 2 to Level 1 | 0 | 0
Fair value liabilities, transfers from Level 1 to Level 2 | 0 | 0
Fair value liabilities, transfers from Level 2 to Level 1 | $ 0 | $ 0
Government Securities and Obligations |  |
Fair Value of Financial Instruments |  |
Percentage of investment amount to collateralized deposits value | 102.00% |

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References No definition available. + Details
Name: | atxs_FairValueAssetsLevel1ToLevel2TransfersAmount1
Namespace Prefix: | atxs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References No definition available. + Details
Name: | atxs_FairValueAssetsLevel2ToLevel1TransfersAmount1
Namespace Prefix: | atxs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References No definition available. + Details
Name: | atxs_FairValueLiabilitiesLevel1ToLevel2TransfersAmount1
Namespace Prefix: | atxs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References No definition available. + Details
Name: | atxs_FairValueLiabilitiesLevel2ToLevel1TransfersAmount1
Namespace Prefix: | atxs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of investment in reverse repurchase agreements which are collateralized by deposits. + References No definition available. + Details
Name: | atxs_PercentageOfInvestmentAmountToCollateralizedDepositsValue
Namespace Prefix: | atxs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueInputsQuantitativeInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_CollateralPledgedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |