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Stockholders' Equity - Additional Information (Detail) (USD $) | 0 Months Ended |  |
--- | --- | --- | ---
Feb. 24, 2014 | Oct. 11, 2013 | Dec. 31, 2014 | Sep. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Capital stock authorized for issuance |  |  | 150,000,000 us-gaap_CapitalUnitsAuthorized |
Common stock, shares authorized |  |  | 145,000,000 us-gaap_CommonStockSharesAuthorized | 145,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, par value |  |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare
Preferred stock, shares authorized |  |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value |  |  | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare
Common stock, shares outstanding |  |  | 54,715,714 us-gaap_CommonStockSharesOutstanding | 54,656,936 us-gaap_CommonStockSharesOutstanding
Preferred stock, shares outstanding |  |  | 18,300 us-gaap_PreferredStockSharesOutstanding | 18,300 us-gaap_PreferredStockSharesOutstanding
Threshold percentage of common stock ownership upon preferred stock conversion |  |  | 9.99%arwr_ThresholdPercentageOfCommonStockOwnershipUponPreferredStockConversion |
Stock issuances, Shares | 6,325,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 3,071,672 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |
Sale of stock, price per share | $ 18.95 us-gaap_SaleOfStockPricePerShare | $ 5.86 us-gaap_SaleOfStockPricePerShare |  |
Conversion price |  | $ 5.86 arwr_ConversionPricePerShare |  |
Proceeds from issuance of common stock and warrants, net | $ 112,600,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 60,000,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |
Series B convertible preferred stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock equivalent of preferred stock |  |  | 1,256,831 arwr_CommonStockEquivalentOfPreferredStockSharesUponConversion / us-gaap_StatementClassOfStockAxis = arwr_ConvertiblePreferredStockSeriesBMember |
Preferred stock, shares outstanding |  |  | 2,300 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = arwr_ConvertiblePreferredStockSeriesBMember |
Series C Preferred Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock equivalent of preferred stock |  |  | 2,730,375 arwr_CommonStockEquivalentOfPreferredStockSharesUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Preferred stock, shares outstanding |  |  | 16,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Stock issuances, Shares |  | 46,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |
Sale of stock, price per share |  | $ 1,000 us-gaap_SaleOfStockPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |
Aggregate price on issuance or Sale of equity |  | $ 64,000,000 arwr_AggregatePriceOnIssuanceOrSaleOfEquity / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |
2004 Equity Incentive Plan, 2013 Equity Incentive Plan, and Inducement Grants |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common Stock, Share reserve for issuance |  |  | 7,274,674 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = arwr_TwoThousandFourEquityIncentivePlanTwoThousandThirteenEquityIncentivePlanAndInducementGrantsMember |

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- Definition Number of authorized capital units or capital shares. This element is relevant to issuers of face-amount certificates and registered investment companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(a)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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