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Consolidated Statement of Stockholders' Equity (unaudited) (USD $) | Total | Common stock issued @ $5.86 | Common stock issued @ $18.95 | Preferred stock issued at $1,000 per share | Common Stock Issued to Galloway | Preferred Stock | Preferred Stock Preferred stock issued at $1,000 per share | Common Stock | Common Stock Common stock issued @ $5.86 | Common Stock Common stock issued @ $18.95 | Common Stock Common Stock Issued to Galloway | Additional Paid-in Capital | Additional Paid-in Capital Common stock issued @ $5.86 | Additional Paid-in Capital Common stock issued @ $18.95 | Additional Paid-in Capital Preferred stock issued at $1,000 per share | Additional Paid-in Capital Common Stock Issued to Galloway | Accumulated Deficit during Development Stage | Non-controlling Interest
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Beginning Balance Amount at Sep. 30, 2013 | $ 25,734,789 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  | $ 10 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | $ 124,859 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | $ 193,514,766 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | $ (166,140,969)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | $ (1,763,877)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Beginning Balance Shares at Sep. 30, 2013 |  |  |  |  |  | 9,900 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 32,489,444 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Exercise of warrants, Amount | 10,148,044 arwr_StockIssuedDuringPeriodValueExerciseOfWarrants |  |  |  |  |  |  | 2,911 arwr_StockIssuedDuringPeriodValueExerciseOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 10,145,133 arwr_StockIssuedDuringPeriodValueExerciseOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Exercise of warrants |  |  |  |  |  |  |  | 2,911,919 arwr_StockIssuedDuringPeriodSharesExerciseOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Stock options exercised, Amount | 2,730,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  |  | 455 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 2,729,545 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Stock options exercised | 454,863 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  | 454,863 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 5,696,173 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  |  |  |  |  | 5,696,173 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Stock issuances |  | 14,060,112 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember | 112,581,559 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember | 46,000,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_PreferredStockIssuedAtThousandDollarPerShareMember | 500,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedToGallowayMember |  | 46 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_PreferredStockIssuedAtThousandDollarPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 3,072 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,325 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 132 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedToGallowayMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 14,057,040 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 112,575,234 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 45,999,954 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_PreferredStockIssuedAtThousandDollarPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 499,868 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedToGallowayMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock issuances, Shares |  |  |  |  |  |  | 46,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = arwr_PreferredStockIssuedAtThousandDollarPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 3,071,672 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,325,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 131,579 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = arwr_IssuedToGallowayMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Settlements related to derivative liability | 5,956,079 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |  |  |  |  |  |  | 5,956,079 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Preferred stock converted to common stock, Amount |  |  |  |  |  | (38)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 9,272 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | (9,234)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Preferred stock converted to common stock, Shares |  |  |  |  |  | (37,600)us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 9,272,459 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Deconsolidation of Calando Pharmaceuticals, Inc. | 1,303,911 us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,303,911 us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net loss | (58,725,412)us-gaap_ProfitLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (58,630,190)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | (95,222)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance Amount at Sep. 30, 2014 | 165,985,255 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  | 18 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 147,026 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 391,164,558 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | (224,771,159)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | (555,188)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance Shares at Sep. 30, 2014 |  |  |  |  |  | 18,300 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 54,656,936 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Exercise of warrants, Amount | 270,624 arwr_StockIssuedDuringPeriodValueExerciseOfWarrants |  |  |  |  |  |  | 53 arwr_StockIssuedDuringPeriodValueExerciseOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 270,571 arwr_StockIssuedDuringPeriodValueExerciseOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Exercise of warrants |  |  |  |  |  |  |  | 53,578 arwr_StockIssuedDuringPeriodSharesExerciseOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Stock options exercised, Amount | 12,976 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  |  | 3 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 12,973 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Stock options exercised | 2,500 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  | 2,500 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 2,014,856 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  |  |  |  |  | 2,014,856 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Exercise of exchange rights, Amount | 1,242 arwr_ExchangeRightsExercisedDuringPeriodValue |  |  |  |  |  |  | 3 arwr_ExchangeRightsExercisedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 1,239 arwr_ExchangeRightsExercisedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Exercise of exchange rights, Shares |  |  |  |  |  |  |  | 2,700 arwr_ExchangeRightsExercisedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Net loss | (22,575,282)us-gaap_ProfitLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,575,282)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember |
Ending Balance Amount at Dec. 31, 2014 | $ 145,709,671 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  | $ 18 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | $ 147,085 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | $ 393,464,197 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | $ (247,346,441)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | $ (555,188)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance Shares at Dec. 31, 2014 |  |  |  |  |  | 18,300 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 54,715,714 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |

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