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Collaboration and License Agreements - Sarepta Therapeutics, Inc. Consideration Components (Details) - Sarepta - Sarepta Collaboration Agreement - USD ($) $ in Thousands |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Feb. 14, 2025 | Feb. 07, 2025 | Nov. 25, 2024 | Mar. 31, 2025
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Upfront payment | $ 500,000 |  |  | $ 500,000
Annual fees |  |  | $ 250,000 | 250,000
Equity premium |  | $ 83,600 |  | 83,612
Fixed consideration |  |  |  | 833,612
Estimated variable consideration |  |  |  | 71,243
Total transaction price |  |  |  | $ 904,855

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- Definition Additional Cash Receivable Under Collaboration Agreement + References No definition available. + Details
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Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaboration Arrangement, Consideration + References No definition available. + Details
Name: | arwr_CollaborationArrangementConsideration
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaboration Arrangement, Fixed Consideration + References No definition available. + Details
Name: | arwr_CollaborationArrangementFixedConsideration
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaboration Arrangement, Variable Consideration + References No definition available. + Details
Name: | arwr_CollaborationArrangementVariableConsideration
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds From Collaboration Arrangements + References No definition available. + Details
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Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Sale Of Stock, Premium On Issuance Of Shares + References No definition available. + Details
Name: | arwr_SaleOfStockPremiumOnIssuanceOfShares
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 808 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479402/808-10-50-1 + Details
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- Details
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- Details
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