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Subsequent Events - Additional Information (Details) - Royalty Pharma Agreement - Subsequent Event $ in Millions | Nov. 09, 2022 USD ($)
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Subsequent Event [Line Items] |
Cash received as due under collaboration agreement | $ 250.0
Milestone payment receivable | 160.0
Milestone payment receivable upon achievement of enrollment in phase 3 clinical trial | 50.0
Milestone payment receivable upon FDA approval | 50.0
Milestone payment receivable upon receipt of royalty payments | 60.0
Royalty payment threshold | 70.0
Maximum |
Subsequent Event [Line Items] |
Initial transaction price | $ 410.0

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- Definition Cash received as due under collaboration agreement. + References No definition available. + Details
Name: | arwr_CashReceivedAsDueUnderCollaborationAgreement
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Initial transaction price. + References No definition available. + Details
Name: | arwr_InitialTransactionPrice
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Milestone Payment Receivable + References No definition available. + Details
Name: | arwr_MilestonePaymentReceivable
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Milestone Payment Receivable Upon Achievement of Enrollment in Phase 3 Clinical Trial + References No definition available. + Details
Name: | arwr_MilestonePaymentReceivableUponAchievementOfEnrollmentInPhase3ClinicalTrial
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Milestone Payment Receivable Upon FDA Approval + References No definition available. + Details
Name: | arwr_MilestonePaymentReceivableUponFDAApproval
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Milestone Payment Receivable, Upon Receipt Of Royalty Payments + References No definition available. + Details
Name: | arwr_MilestonePaymentReceivableUponReceiptOfRoyaltyPayments
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Royalty Payment Threshold + References No definition available. + Details
Name: | arwr_RoyaltyPaymentThreshold
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=arwr_RoyaltyPharmaAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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