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Consolidated Statements Of Operations (USD $)
 3 Months Ended 6 Months Ended 107 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Consolidated Statements Of Operations [Abstract]          
REVENUE $ 31,250   $ 55,208 $ 296,139 $ 4,047,167
OPERATING EXPENSES          
Salaries and payroll related costs 2,017,064 425,600 3,337,757 733,491 23,314,966
General and administrative expenses 930,914 815,454 2,197,824 1,438,708 27,111,716
Research and development 1,358,691 140,658 2,127,765 2,402,511 39,355,050
Stock-based compensation 169,390 362,096 421,268 732,244 12,761,332
Depreciation & amortization 423,948 67,810 878,391 136,570 6,538,702
TOTAL OPERATING EXPENSES 4,900,007 1,811,618 8,963,005 5,443,524 109,081,766
OPERATING LOSS (4,868,757) (1,811,618) (8,907,797) (5,147,385) (105,034,599)
OTHER INCOME (EXPENSE)          
Equity in income (loss) of unconsolidated affiliates (64,261) (74,827) (170,788) (26,000) (894,041)
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 (33,484)   (33,484)   (160,572)
Realized and unrealized gain (loss) in marketable securities   359,920 (58,091) 359,920 62,954
Interest income (expense), net 5,015 35,037 12,890 50,283 2,727,368
Change in value of derivatives (622,145) 404,152 (689,048) 869,422 2,205,464
Other income         250,000
TOTAL OTHER INCOME (EXPENSE) (714,875) 724,282 637,586 1,253,625 8,060,080
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (5,583,632) (1,087,336) (8,270,211) (3,893,760) (96,974,519)
Provision for income taxes               
LOSS FROM CONTINUING OPERATIONS (5,583,632) (1,087,336) (8,270,211) (3,893,760) (96,974,519)
Income (loss) from discontinued operations (483) (132,495) (702) 1,442,500 (47,547,264)
Gain on disposal of discontinued operations   3,919,213   3,919,213 4,708,588
NET INCOME (LOSS) FROM DISCONTINUED OPERATIONS (483) 3,786,718 (702) 5,361,713 (42,838,676)
NET INCOME (LOSS) (5,584,115) 2,699,382 (8,270,913) 1,467,953 (139,813,195)
Net (income) loss attributable to noncontrolling interests 248,882 205,855 450,176 (398) 18,284,666
NET INCOME (LOSS) ATTRIBUTABLE TO ARROWHEAD $ (5,335,233) $ 2,905,237 $ (7,820,737) $ 1,467,555 $ (121,528,529)
Earnings per share-basic:          
Loss from continuing operations attributable to Arrowhead common shareholders $ (0.50) $ (0.13) $ (0.75) $ (0.55)  
Income from discontinued operations attributable to Arrowhead common shareholders   $ 0.53   $ 0.75  
Net income (loss) attributable to Arrowhead shareholders $ (0.50) $ 0.40 $ (0.75) $ 0.20  
Weighted average shares outstanding 10,663,869 7,180,669 10,390,986 7,179,290  
Earnings per share-diluted:          
Loss from continuing operations attributable to Arrowhead common shareholders $ (0.50) $ (0.11) $ (0.75) $ (0.49)  
Income from discontinued operations attributable to Arrowhead common shareholders   $ 0.48   $ 0.67  
Net income (loss) attributable to Arrowhead shareholders $ (0.50) $ 0.37 $ (0.75) $ 0.18  
Weighted average shares outstanding 10,663,869 7,891,395 10,390,986 7,994,702