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Stockholders' Equity - Summary of Information About Warrants (Detail) (USD $) | 3 Months Ended
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Dec. 31, 2014
Class Of Warrant Or Right [Line Items] |
Warrants outstanding | 1,437,011 us-gaap_ClassOfWarrantOrRightOutstanding
Warrant 1 |
Class Of Warrant Or Right [Line Items] |
Exercise prices | $ 70.60 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantOneMember
Warrants outstanding | 94,897 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantOneMember
Remaining Life in Years | 2 years 4 months 24 days
Warrant 2 |
Class Of Warrant Or Right [Line Items] |
Exercise prices | $ 5.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantTwoMember
Warrants outstanding | 390,625 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantTwoMember
Remaining Life in Years | 8 months 12 days
Warrant 3 |
Class Of Warrant Or Right [Line Items] |
Exercise prices | $ 5.09 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantThreeMember
Warrants outstanding | 239,534 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantThreeMember
Remaining Life in Years | 6 months
Warrant 4 |
Class Of Warrant Or Right [Line Items] |
Exercise prices | $ 1.38 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantFourMember
Warrants outstanding | 24,324 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantFourMember
Remaining Life in Years | 1 year
Warrant 5 |
Class Of Warrant Or Right [Line Items] |
Exercise prices | $ 4.16 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantFiveMember
Warrants outstanding | 1,000 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantFiveMember
Remaining Life in Years | 2 years
Warrant 6 |
Class Of Warrant Or Right [Line Items] |
Exercise prices | $ 3.25 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantSixMember
Warrants outstanding | 334,347 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantSixMember
Remaining Life in Years | 1 year 7 months 6 days
Warrant 7 |
Class Of Warrant Or Right [Line Items] |
Exercise prices | $ 2.12 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantSevenMember
Warrants outstanding | 75,000 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantSevenMember
Remaining Life in Years | 3 years
Warrant 8 |
Class Of Warrant Or Right [Line Items] |
Exercise prices | $ 1.83 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantEightMember
Warrants outstanding | 277,284 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_WarrantEightMember
Remaining Life in Years | 3 years

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