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Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Sep. 30, 2014
CURRENT ASSETS    
Cash and cash equivalents $ 96,447,301us-gaap_CashAndCashEquivalentsAtCarryingValue $ 132,510,610us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid expenses 3,811,096us-gaap_PrepaidExpenseCurrent 588,626us-gaap_PrepaidExpenseCurrent
Other current assets 327,384us-gaap_OtherAssetsCurrent 48,502us-gaap_OtherAssetsCurrent
Short term investments 19,561,172us-gaap_HeldToMaturitySecuritiesCurrent 21,653,032us-gaap_HeldToMaturitySecuritiesCurrent
TOTAL CURRENT ASSETS 120,146,953us-gaap_AssetsCurrent 154,800,770us-gaap_AssetsCurrent
Property and equipment, net 4,127,366us-gaap_PropertyPlantAndEquipmentNet 3,872,753us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 25,701,657us-gaap_IntangibleAssetsNetExcludingGoodwill 1,013,473us-gaap_IntangibleAssetsNetExcludingGoodwill
Investments 12,361,068us-gaap_HeldToMaturitySecuritiesNoncurrent 23,088,346us-gaap_HeldToMaturitySecuritiesNoncurrent
Other assets 41,414us-gaap_OtherAssetsMiscellaneousNoncurrent 41,414us-gaap_OtherAssetsMiscellaneousNoncurrent
TOTAL ASSETS 162,378,458us-gaap_Assets 182,816,756us-gaap_Assets
CURRENT LIABILITIES    
Accounts payable 4,936,282us-gaap_AccountsPayableCurrent 2,579,478us-gaap_AccountsPayableCurrent
Accrued expenses 2,041,174us-gaap_AccruedLiabilitiesCurrent 1,399,486us-gaap_AccruedLiabilitiesCurrent
Due to Novartis 3,000,000arwr_AssetAcquisitionAccruedPurchasePricePayable  
Accrued payroll and benefits 1,272,001us-gaap_EmployeeRelatedLiabilitiesCurrent 3,268,506us-gaap_EmployeeRelatedLiabilitiesCurrent
Deferred revenue 65,625us-gaap_DeferredRevenueCurrent 103,125us-gaap_DeferredRevenueCurrent
Derivative liabilities 1,619,755us-gaap_DerivativeLiabilitiesCurrent 4,173,943us-gaap_DerivativeLiabilitiesCurrent
Capital lease obligation 215,762us-gaap_CapitalLeaseObligationsCurrent 213,991us-gaap_CapitalLeaseObligationsCurrent
Notes payable   50,000us-gaap_NotesPayableCurrent
Other current liabilities 59,762us-gaap_OtherLiabilitiesCurrent 58,495us-gaap_OtherLiabilitiesCurrent
TOTAL CURRENT LIABILITIES 13,210,361us-gaap_LiabilitiesCurrent 11,847,024us-gaap_LiabilitiesCurrent
LONG-TERM LIABILITIES    
Capital lease obligation, net of current portion 650,014us-gaap_CapitalLeaseObligationsNoncurrent 758,340us-gaap_CapitalLeaseObligationsNoncurrent
Contingent consideration obligations 3,970,931us-gaap_BusinessCombinationContingentConsiderationLiability 3,970,931us-gaap_BusinessCombinationContingentConsiderationLiability
Other non-current liabilities 350,798us-gaap_OtherLiabilitiesNoncurrent 255,206us-gaap_OtherLiabilitiesNoncurrent
TOTAL LONG-TERM LIABILITIES 4,971,743us-gaap_LiabilitiesNoncurrent 4,984,477us-gaap_LiabilitiesNoncurrent
Commitments and contingencies      
Arrowhead Research Corporation stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized; 15,652 and 18,300 shares issued and outstanding as of March 31, 2015 and September 30, 2014, respectively 16us-gaap_PreferredStockValue 18us-gaap_PreferredStockValue
Common stock, $0.001 par value; 145,000,000 shares authorized; 59,435,862 and 54,656,936 shares issued and outstanding as of March 31, 2015 and September 30, 2014, respectively 151,805us-gaap_CommonStockValue 147,026us-gaap_CommonStockValue
Additional paid-in capital 420,696,539us-gaap_AdditionalPaidInCapital 391,164,558us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income (loss) (63,965)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Accumulated deficit (276,032,853)us-gaap_RetainedEarningsAccumulatedDeficit (224,771,159)us-gaap_RetainedEarningsAccumulatedDeficit
Total Arrowhead Research Corporation stockholders' equity 144,751,542us-gaap_StockholdersEquity 166,540,443us-gaap_StockholdersEquity
Noncontrolling interest (555,188)us-gaap_MinorityInterest (555,188)us-gaap_MinorityInterest
TOTAL STOCKHOLDERS’ EQUITY 144,196,354us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 165,985,255us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 162,378,458us-gaap_LiabilitiesAndStockholdersEquity $ 182,816,756us-gaap_LiabilitiesAndStockholdersEquity