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Consolidated Statements Of Operations (USD $)
 3 Months Ended 104 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Consolidated Statements Of Operations [Abstract]      
REVENUE $ 23,958 $ 296,139 $ 4,015,917
OPERATING EXPENSES      
Salaries 1,320,693 307,890 21,297,902
General and administrative expenses 1,277,904 631,561 26,868,719
Research and development 1,140,904 2,261,855 41,569,633
Stock-based compensation 251,878 370,148 12,591,942
Amortization of intangible assets 71,618 60,452 1,853,562
TOTAL OPERATING EXPENSES 4,062,997 3,631,906 104,181,758
OPERATING LOSS (4,039,039) (3,335,767) (100,165,841)
OTHER INCOME (EXPENSE)      
Equity in income (loss) of unconsolidated affiliates (106,527) 48,826 (829,780)
Gain on sale of stock in subsidiary     2,292,800
Gain on purchase of Roche Madison 1,576,107   1,576,107
Gain (loss) on sale of fixed assets, net     (127,088)
Realized and unrealized gain (loss) in marketable securities (58,091)   62,954
Interest income (expense), net 7,875 15,247 2,722,353
Change in value of derivatives (66,904) 465,270 2,827,609
Other income     250,000
TOTAL OTHER INCOME 1,352,461 529,343 8,774,955
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (2,686,579) (2,806,424) (91,390,887)
Provision for income taxes         
LOSS FROM CONTINUING OPERATIONS (2,686,579) (2,806,424) (91,390,887)
Income (loss) from discontinued operations (220) 1,574,994 (47,546,782)
Gain on disposal of discontinued operations     4,708,588
NET INCOME (LOSS) FROM DISCONTINUED OPERATIONS (220) 1,574,994 (42,838,194)
NET LOSS (2,686,799) (1,231,430) (134,229,081)
Net (income) loss attributable to noncontrolling interests 201,294 (206,252) 18,035,784
NET LOSS ATTRIBUTABLE TO ARROWHEAD $ (2,485,505) $ (1,437,682) $ (116,193,297)
Earnings per share-basic and diluted:      
Loss from continuing operations attributable to Arrowhead common shareholders $ (0.25) $ (0.42)  
Income from discontinued operations attributable to Arrowhead common shareholders   $ 0.22  
Net loss attributable to Arrowhead shareholders $ (0.25) $ (0.20)  
Weighted average shares outstanding-basic and diluted 10,121,069 7,177,941