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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Jun. 30, 2010 | Dec. 31, 2012 | Jan. 31, 2013
Fair Value Measurements Disclosure [Line Items] |  |  |  |  |  |
Short term investments | $ 23,532,402 us-gaap_MarketableSecuritiesCurrent |  | $ 21,653,032 us-gaap_MarketableSecuritiesCurrent |  |  |
Investments | 17,806,499 us-gaap_MarketableSecuritiesNoncurrent |  | 23,088,346 us-gaap_MarketableSecuritiesNoncurrent |  |  |
Total investments | 41,338,901 us-gaap_MarketableSecurities |  | 44,741,378 us-gaap_MarketableSecurities |  |  |
Fair value of investment | 40,759,068 us-gaap_InvestmentsFairValueDisclosure |  | 44,333,855 us-gaap_InvestmentsFairValueDisclosure |  |  |
Warrants outstanding | 1,437,011 us-gaap_ClassOfWarrantOrRightOutstanding |  |  |  |  |
Non-cash gain (loss) from change in fair value of the derivative liability | 2,179,651 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings | (3,507,496)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings |  |  |  |
Duration of exchange rights | 7 years |  |  |  |  |
Ablaris Therapeutics |  |  |  |  |  |
Fair Value Measurements Disclosure [Line Items] |  |  |  |  |  |
Warrants outstanding | 585,000 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember |  |  |  |  |
Non-cash gain (loss) from change in fair value of the derivative liability | $ 202,491 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember | $ (12,082)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember |  |  |  |
Exchange right convertible conversion ratio for first year | 0.06 arwr_ExchangeRightConvertibleConversionRatioForFirstYear / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember |  |  |  |  |
Exchange right convertible conversion ratio for second year | 0.04 arwr_ExchangeRightConvertibleConversionRatioForTwoYear / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember |  |  |  |  |
Exchange right convertible conversion ratio for third year | 0.03 arwr_ExchangeRightConvertibleConversionRatioForThreeYear / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember |  |  |  |  |
Exchange right convertible conversion ratio for fourth year | 0.02 arwr_ExchangeRightConvertibleConversionRatioForFourYear / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember |  |  |  |  |
Exchange right convertible conversion ratio for fifth year and beyond | 0.01 arwr_ExchangeRightConvertibleConversionRatioForFiveYear / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember |  |  |  |  |
Number of exchange right sold | 675,000 arwr_NumberOfExchangeRightAreSold / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = arwr_AblarisTherapeuticsMember |  |  |  |  |
2010 Warrants |  |  |  |  |  |
Fair Value Measurements Disclosure [Line Items] |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  | 329,649 arwr_WarrantsIssuedToAcquireCommonStock / us-gaap_ClassOfWarrantOrRightAxis = arwr_TwoThousandTenWarrantMember |  |
Warrants outstanding | 24,324 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_TwoThousandTenWarrantMember |  |  |  |  |
2012 Warrants |  |  |  |  |  |
Fair Value Measurements Disclosure [Line Items] |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  | 912,543 arwr_WarrantsIssuedToAcquireCommonStock / us-gaap_ClassOfWarrantOrRightAxis = arwr_TwoThousandTwelveWarrantMember |
Warrants outstanding | 265,161 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_TwoThousandTwelveWarrantMember |  |  |  |  |
2013 Warrants |  |  |  |  |  |
Fair Value Measurements Disclosure [Line Items] |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  |  | 833,530 arwr_WarrantsIssuedToAcquireCommonStock / us-gaap_ClassOfWarrantOrRightAxis = arwr_TwoThousandThirteenWarrantMember
Warrants outstanding | 12,123 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = arwr_TwoThousandThirteenWarrantMember |  |  |  |  |

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