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Consolidated Statements Of Operations (USD $)
 12 Months Ended 101 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Consolidated Statements Of Operations [Abstract]      
REVENUE $ 296,139   $ 3,991,959
OPERATING EXPENSES      
Salaries 1,408,366 1,146,394 19,977,209
General and administrative expenses 3,821,550 2,490,725 25,590,815
Research and development 3,277,760 529,601 40,428,729
Stock-based compensation 1,376,921 1,424,293 12,340,064
Patent amortization 241,808 241,808 1,781,944
TOTAL OPERATING EXPENSES 10,126,405 5,832,821 100,118,761
OPERATING LOSS (9,830,266) (5,832,821) (96,126,802)
OTHER INCOME (EXPENSE)      
Loss on equity of investments - Nanotope (163,180) (219,540) (723,253)
Gain on sale of stock in subsidiary     2,292,800
Gain/(loss) on sale of fixed assets, net   1,772 (127,088)
Realized and unrealized gain (loss) on marketable securities (261,219)   121,045
Interest income (expense), net 86,530 (22,783) 2,714,478
Change in value of derivatives 1,133,127 1,761,385 2,894,512
Other income 250,000   250,000
TOTAL OTHER INCOME (EXPENSE) 1,045,258 1,520,834 7,422,494
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (8,785,008) (4,311,987) (88,704,308)
Provision for income taxes         
LOSS FROM CONTINUING OPERATIONS (8,785,008) (4,311,987) (88,704,308)
Income (loss) from discontinued operations 1,373,396 (2,645,051) (47,546,562)
Gain on disposal of discontinued operations 3,919,213   4,708,588
NET INCOME (LOSS) FROM DISCONTINUED OPERATIONS 5,292,609 (2,645,051) (42,837,974)
NET LOSS (3,492,399) (6,957,038) (131,542,282)
Net (income) loss attributable to noncontrolling interests 363,514 1,182,990 17,834,490
NET LOSS ATTRIBUTABLE TO ARROWHEAD $ (3,128,885) $ (5,774,048) $ (113,707,792)
Earnings per share - basic:      
Income (loss) from continuing operations attributable to Arrowhead common shareholders $ (1.18) $ (0.49)  
Income (loss) from discontinued operations attributable to Arrowhead common shareholders $ 0.74 $ (0.41)  
Net loss attributable to Arrowhead shareholders $ (0.44) $ (0.90)  
Weighted average shares outstanding 7,181,121 6,434,245  
Earnings per share - diluted:      
Income (loss) from continuing operations attributable to Arrowhead common shareholders $ (1.08) $ (0.49)  
Income (loss) from discontinued operations attributable to Arrowhead common shareholders $ 0.68 $ (0.41)   
Net loss attributable to Arrowhead shareholders $ (0.40) $ (0.90)  
Weighted average shares outstanding 7,830,407 6,434,245