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Consolidated Statements of Cash Flows (unaudited) (USD $)
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (22,575,282)us-gaap_ProfitLoss $ (10,685,732)us-gaap_ProfitLoss
Net loss attributable to noncontrolling interests    57,420us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
NET LOSS ATTRIBUTABLE TO ARROWHEAD (22,575,282)us-gaap_NetIncomeLoss (10,628,312)us-gaap_NetIncomeLoss
(Gain) loss on disposal of fixed assets 26,381us-gaap_GainLossOnSaleOfPropertyPlantEquipment 53,562us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Change in value of derivatives (2,382,142)us-gaap_UnrealizedGainLossOnDerivatives 3,519,579us-gaap_UnrealizedGainLossOnDerivatives
Stock-based compensation 2,014,856us-gaap_ShareBasedCompensation 521,138us-gaap_ShareBasedCompensation
Depreciation and amortization 290,039us-gaap_DepreciationAndAmortization 403,405us-gaap_DepreciationAndAmortization
Amortization/accretion of note premiums/discounts, net 347,703us-gaap_AmortizationOfDebtDiscountPremium 28,443us-gaap_AmortizationOfDebtDiscountPremium
Non-controlling interest    (57,420)arwr_NoncontrollingInterest
Changes in operating assets and liabilities:    
Receivables (127,000)us-gaap_IncreaseDecreaseInReceivables (11,825)us-gaap_IncreaseDecreaseInReceivables
Other receivables (9,506)us-gaap_IncreaseDecreaseInOtherReceivables   
Prepaid expenses (3,874,051)us-gaap_IncreaseDecreaseInPrepaidExpense (74,455)us-gaap_IncreaseDecreaseInPrepaidExpense
Accounts payable 3,415,473us-gaap_IncreaseDecreaseInAccountsPayable (610,284)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses (1,325,675)us-gaap_IncreaseDecreaseInAccruedLiabilities 56,648us-gaap_IncreaseDecreaseInAccruedLiabilities
Other liabilities (802)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (222,811)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
NET CASH USED IN OPERATING ACTIVITIES (24,200,006)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (7,022,332)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (554,945)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (116,215)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of fixed assets 500us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment   
Purchase of marketable securities    (19,075,306)us-gaap_PaymentsToAcquireMarketableSecurities
Proceeds from sale of marketable securities 3,054,774us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 4,045,956us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Other investing activities (7,000,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities   
NET CASH USED IN INVESTING ACTIVITIES (4,499,671)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (15,145,565)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on capital leases and notes payable (103,168)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (54,715)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from issuance of common stock and preferred stock, net    62,821,592us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Proceeds from the exercise of warrants and stock options 283,466arwr_ProceedsFromExerciseOfWarrantsAndStockOptions   
NET CASH PROVIDED BY FINANCING ACTIVITIES 180,298us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 62,766,877us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
NET INCREASE (DECREASE) IN CASH (28,519,379)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 40,598,980us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AT BEGINNING OF PERIOD 132,510,610us-gaap_CashAndCashEquivalentsAtCarryingValue 19,114,444us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AT END OF PERIOD 103,991,231us-gaap_CashAndCashEquivalentsAtCarryingValue 59,713,424us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplementary disclosures:    
Interest paid $ 3,938us-gaap_InterestPaid $ 9,496us-gaap_InterestPaid