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Consolidated Statements of Operations (unaudited) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]        
REVENUE $ 43,750us-gaap_Revenues $ 43,750us-gaap_Revenues $ 214,500us-gaap_Revenues $ 87,500us-gaap_Revenues
OPERATING EXPENSES        
Research and development 11,640,794us-gaap_ResearchAndDevelopmentExpense 5,216,446us-gaap_ResearchAndDevelopmentExpense 29,387,524us-gaap_ResearchAndDevelopmentExpense 8,349,460us-gaap_ResearchAndDevelopmentExpense
Acquired in-process research and development 10,142,786arwr_AcquiredInProcessResearchAndDevelopment   10,142,786arwr_AcquiredInProcessResearchAndDevelopment  
Salaries and payroll-related costs 3,541,652us-gaap_LaborAndRelatedExpense 3,097,902us-gaap_LaborAndRelatedExpense 6,692,268us-gaap_LaborAndRelatedExpense 5,179,693us-gaap_LaborAndRelatedExpense
General and administrative expenses 1,696,623us-gaap_GeneralAndAdministrativeExpense 1,347,677us-gaap_GeneralAndAdministrativeExpense 3,782,826us-gaap_GeneralAndAdministrativeExpense 2,261,461us-gaap_GeneralAndAdministrativeExpense
Stock-based compensation 2,205,079us-gaap_ShareBasedCompensation 1,198,444us-gaap_ShareBasedCompensation 4,219,935us-gaap_ShareBasedCompensation 1,719,582us-gaap_ShareBasedCompensation
Depreciation and amortization 449,559us-gaap_DepreciationAndAmortization 395,779us-gaap_DepreciationAndAmortization 739,598us-gaap_DepreciationAndAmortization 799,184us-gaap_DepreciationAndAmortization
TOTAL OPERATING EXPENSES 29,676,493us-gaap_OperatingExpenses 11,256,248us-gaap_OperatingExpenses 54,964,937us-gaap_OperatingExpenses 18,309,380us-gaap_OperatingExpenses
OPERATING LOSS (29,632,743)us-gaap_OperatingIncomeLoss (11,212,498)us-gaap_OperatingIncomeLoss (54,750,437)us-gaap_OperatingIncomeLoss (18,221,880)us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE)        
Equity in income (loss) of unconsolidated affiliates   (9,597)us-gaap_IncomeLossFromEquityMethodInvestments   (148,053)us-gaap_IncomeLossFromEquityMethodInvestments
Gain (loss) on sale of fixed assets, net 45,576us-gaap_GainLossOnSaleOfPropertyPlantEquipment (5,316)us-gaap_GainLossOnSaleOfPropertyPlantEquipment 19,195us-gaap_GainLossOnSaleOfPropertyPlantEquipment (58,878)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Interest income (expense), net 198,113us-gaap_InterestIncomeExpenseNonoperatingNet 119,390us-gaap_InterestIncomeExpenseNonoperatingNet 435,530us-gaap_InterestIncomeExpenseNonoperatingNet 159,968us-gaap_InterestIncomeExpenseNonoperatingNet
Change in value of derivatives 168,974us-gaap_UnrealizedGainLossOnDerivatives (2,951,225)us-gaap_UnrealizedGainLossOnDerivatives 2,551,116us-gaap_UnrealizedGainLossOnDerivatives (6,470,803)us-gaap_UnrealizedGainLossOnDerivatives
Other income (expense) 536,087us-gaap_OtherNonoperatingIncomeExpense 76,546us-gaap_OtherNonoperatingIncomeExpense 482,902us-gaap_OtherNonoperatingIncomeExpense 71,215us-gaap_OtherNonoperatingIncomeExpense
TOTAL OTHER INCOME (EXPENSE) 948,750us-gaap_NonoperatingIncomeExpense (2,770,202)us-gaap_NonoperatingIncomeExpense 3,488,743us-gaap_NonoperatingIncomeExpense (6,446,551)us-gaap_NonoperatingIncomeExpense
LOSS BEFORE INCOME TAXES (28,683,993)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (13,982,700)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (51,261,694)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (24,668,431)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
NET LOSS (28,683,993)us-gaap_ProfitLoss (13,982,700)us-gaap_ProfitLoss (51,261,694)us-gaap_ProfitLoss (24,668,431)us-gaap_ProfitLoss
Net loss attributable to noncontrolling interests   40,179us-gaap_NetIncomeLossAttributableToNoncontrollingInterest   97,600us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
NET LOSS ATTRIBUTABLE TO ARROWHEAD (28,683,993)us-gaap_NetIncomeLoss (13,942,521)us-gaap_NetIncomeLoss (51,261,694)us-gaap_NetIncomeLoss (24,570,831)us-gaap_NetIncomeLoss
NET LOSS PER SHARE ATTRIBUTABLE TO ARROWHEAD SHAREHOLDERS - BASIC AND DILUTED: $ (0.51)us-gaap_EarningsPerShareBasicAndDiluted $ (0.31)us-gaap_EarningsPerShareBasicAndDiluted $ (0.93)us-gaap_EarningsPerShareBasicAndDiluted $ (0.60)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding - basic and diluted 55,719,923us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 44,321,847us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 55,200,512us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 40,941,903us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX        
Foreign Currency Translation Adjustments (63,965)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax   (63,965)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax  
COMPREHENSIVE LOSS ATTRIBUTABLE TO ARROWHEAD $ (28,747,958)us-gaap_ComprehensiveIncomeNetOfTax $ (13,942,521)us-gaap_ComprehensiveIncomeNetOfTax $ (51,325,659)us-gaap_ComprehensiveIncomeNetOfTax $ (24,570,831)us-gaap_ComprehensiveIncomeNetOfTax