XML 49 R40.htm IDEA: XBRL DOCUMENT
v3.22.2

Financial Instruments - Fair value hierarchy (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Reverse repurchase agreements | Government Securities and Obligations | Minimum |  |
Financial Instruments |  |
Percentage of investment amount to collateralized deposits value | 102.00% |
Recurring |  |
Assets: |  |
Total | $ 87,543 | $ 40,853
Recurring | Level 1 |  |
Assets: |  |
Total | 3,391 | 1,853
Recurring | Level 2 |  |
Assets: |  |
Total | 84,152 | 39,000
Recurring | Money market funds |  |
Assets: |  |
Cash equivalents | 3,391 | 1,853
Recurring | Money market funds | Level 1 |  |
Assets: |  |
Cash equivalents | 3,391 | 1,853
Recurring | Corporate debt securities |  |
Assets: |  |
Cash equivalents | 1,000 |
Short-term investments | 23,685 |
Recurring | Corporate debt securities | Level 2 |  |
Assets: |  |
Cash equivalents | 1,000 |
Short-term investments | 23,685 |
Recurring | Commercial paper |  |
Assets: |  |
Short-term investments | 8,984 |
Recurring | Commercial paper | Level 2 |  |
Assets: |  |
Short-term investments | 8,984 |
Recurring | Yankee securities |  |
Assets: |  |
Short-term investments | 6,998 |
Recurring | Yankee securities | Level 2 |  |
Assets: |  |
Short-term investments | 6,998 |
Recurring | U.S. agency bonds |  |
Assets: |  |
Short-term investments | 2,985 |
Recurring | U.S. agency bonds | Level 2 |  |
Assets: |  |
Short-term investments | 2,985 |
Recurring | Reverse repurchase agreements |  |
Assets: |  |
Cash equivalents | 10,500 |
Short-term investments | 30,000 | 39,000
Recurring | Reverse repurchase agreements | Level 2 |  |
Assets: |  |
Cash equivalents | 10,500 |
Short-term investments | $ 30,000 | $ 39,000

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
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=atxs_ReverseRepurchaseAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=atxs_DebtObligationsIssuedByForeignEntityOrGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |