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Consolidated Statements Of Cash Flows (USD $)
 3 Months Ended 104 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (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)
(Income) loss from discontinued operations 220 (1,574,994) 42,838,194
Realized and unrealized (gain) loss on investments 58,091   (762,954)
(Gain) loss from sale of subsidiary     (306,344)
(Gain) loss on purchase of Roche Madison (1,576,107)   (1,576,107)
Loss on sale/donation of fixed assets     127,088
Stock issued as gift     298,750
Stock issued for professional services     442,882
Stock issued for in-process research and development     13,166,347
Change in value of derivatives 66,904 (465,270) (2,827,609)
Purchased in-process research and development - Nanoconduction     2,685,208
Stock-based compensation 251,878 370,148 12,591,942
Depreciation and amortization 454,444 68,761 6,114,755
Amortization (accretion) of note discounts, net 3,783   (4,155)
Gain on sale of stock in subsidiary     (2,292,800)
Equity in income (loss) of unconsolidated affiliates 106,527 (48,826) 829,780
Noncontrolling interest (201,294) 206,252 (18,035,784)
Gain on renegotiation of accrued severance     (726,500)
Changes in operating assets and liabilities:      
Receivables 172,230   109,415
Other receivables (419,238) 86,419 (2,024,201)
Prepaid expenses (30,070) 4,080 (172,638)
Other current assets (1) 96,363 (96,361)
Deposits     (36,795)
Accounts payable 137,448 1,852,324 343,882
Accrued expenses 408,783 (20,865) 943,323
Accrued severance and other liabilities 346,551 (16,012) 1,320,916
NET CASH USED IN OPERATING ACTIVITIES OF CONTINUING OPERATIONS (2,705,356) (879,302) (63,243,063)
CASH FLOWS FROM INVESTING ACTIVITIES OF CONTINUING OPERATIONS:      
Purchase of marketable securities - US Treasury Bills     (18,575,915)
Purchase of property and equipment (69,424)   (3,635,023)
Purchase of MASA Energy, LLC     (250,000)
Minority equity investment     (2,000,000)
Cash paid for interest in Insert     (10,150,000)
Cash obtained from interest in Insert     10,529,594
Proceeds from sale of marketable securities - US Treasury Bills     18,888,265
Proceeds from sale of investments 509,009   3,313,609
Proceeds from sale of subsidiaries     359,375
Proceeds from sale of fixed assets     142,375
Payment for patents     (303,440)
Restricted cash     50,773
Cash transferred in acquisition/divestitures 100,035   (1,600,363)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES OF CONTINUING OPERATIONS 539,620   (3,230,750)
CASH FLOWS FROM FINANCING ACTIVITIES OF CONTINUING OPERATIONS:      
Principal payments on capital leases (39,940)   (39,940)
Proceeds from issuance of Calando debt     2,516,467
Proceeds from sale of stock in subsidiary 8,000   20,902,100
Proceeds from issuance of common stock and warrants, net 1,463,833 43,279 96,758,613
NET CASH PROVIDED BY FINANCING ACTIVITIES OF CONTINUING OPERATIONS 1,431,893 43,279 120,137,240
Cash flows from discontinued operations:      
Operating cash flows (420) (544,335) (46,003,927)
Investing cash flows     790,625
Financing cash flows     (1,677,000)
Net cash provided by (used in) discontinued operations: (420) (544,335) (46,890,302)
NET INCREASE (DECREASE) IN CASH (734,263) (1,380,358) 6,773,126
CASH AT BEGINNING OF PERIOD 7,507,389 6,847,162  
CASH AT END OF PERIOD 6,773,126 5,466,804 6,773,126
Supplementary disclosures:      
Interest paid 10,300   240,719
Taxes paid     $ 742,500