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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: