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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
Beginning Balance Amount at Sep. 30, 2013 $ 25,734,789us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest         $ 10us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  $ 124,859us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      $ 193,514,766us-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           9,900us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  32,489,444us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                   
Exercise of warrants, Amount 10,148,044arwr_StockIssuedDuringPeriodValueExerciseOfWarrants             2,911arwr_StockIssuedDuringPeriodValueExerciseOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      10,145,133arwr_StockIssuedDuringPeriodValueExerciseOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Exercise of warrants               2,911,919arwr_StockIssuedDuringPeriodSharesExerciseOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                   
Stock options exercised, Amount 2,730,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised             455us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      2,729,545us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Stock options exercised 454,863us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised             454,863us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                   
Stock-based compensation 5,696,173us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue                     5,696,173us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Stock issuances   14,060,112us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember
112,581,559us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember
46,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_PreferredStockIssuedAtThousandDollarPerShareMember
500,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedToGallowayMember
  46us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_PreferredStockIssuedAtThousandDollarPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  3,072us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
6,325us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
132us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedToGallowayMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  14,057,040us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
112,575,234us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
45,999,954us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_PreferredStockIssuedAtThousandDollarPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
499,868us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedToGallowayMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Stock issuances, Shares             46,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_PreferredStockIssuedAtThousandDollarPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  3,071,672us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
6,325,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
131,579us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedToGallowayMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
             
Settlements related to derivative liability 5,956,079us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax                     5,956,079us-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
  9,272us-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
  9,272,459us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                   
Deconsolidation of Calando Pharmaceuticals, Inc. 1,303,911us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation                                 1,303,911us-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 165,985,255us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest         18us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  147,026us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      391,164,558us-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           18,300us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  54,656,936us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                   
Exercise of warrants, Amount 270,624arwr_StockIssuedDuringPeriodValueExerciseOfWarrants             53arwr_StockIssuedDuringPeriodValueExerciseOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      270,571arwr_StockIssuedDuringPeriodValueExerciseOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Exercise of warrants               53,578arwr_StockIssuedDuringPeriodSharesExerciseOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                   
Stock options exercised, Amount 12,976us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised             3us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      12,973us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Stock options exercised 2,500us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised             2,500us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                   
Stock-based compensation 2,014,856us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue                     2,014,856us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Exercise of exchange rights, Amount 1,242arwr_ExchangeRightsExercisedDuringPeriodValue             3arwr_ExchangeRightsExercisedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      1,239arwr_ExchangeRightsExercisedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Exercise of exchange rights, Shares               2,700arwr_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 $ 145,709,671us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest         $ 18us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  $ 147,085us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      $ 393,464,197us-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           18,300us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  54,715,714us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember