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Accrued Liabilities - Additional Information (Details) - Related Party - Paragon Agreement $ in Millions | Jun. 22, 2023 USD ($)
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Accrued Liabilities [Line Items] |
Related party expenses incurred prior to asset acquisition | $ 19.0
Research initiation fees | 3.0
Reimbursable research costs | 16.0
Related party expenses unpaid prior to asset acquisition | $ 19.0

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- Definition Accrued liabilities. + References No definition available. + Details
Name: | agle_AccruedLiabilitiesLineItems
Namespace Prefix: | agle_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reimbursable research costs. + References No definition available. + Details
Name: | agle_ReimbursableResearchCosts
Namespace Prefix: | agle_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party expenses incurred prior to asset acquisition. + References No definition available. + Details
Name: | agle_RelatedPartyExpensesIncurredPriorToAssetAcquisition
Namespace Prefix: | agle_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party expenses unpaid prior to asset acquisition. + References No definition available. + Details
Name: | agle_RelatedPartyExpensesUnpaidPriorToAssetAcquisition
Namespace Prefix: | agle_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Research initiation fees. + References No definition available. + Details
Name: | agle_ResearchInitiationFees
Namespace Prefix: | agle_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_RelatedPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=agle_ParagonAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |