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Consolidated Statements Of Cash Flows (USD $)
 6 Months Ended 107 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ (8,270,913) $ 1,467,953 $ (139,813,195)
Net (income) loss attributable to noncontrolling interests 450,176 (398) 18,284,666
Net income (loss) attributable to Arrowhead (7,820,737) 1,467,555 (121,528,529)
(Income) loss from discontinued operations 702 (5,361,713) 42,838,676
Realized and unrealized (gain) loss on investments 58,091 (359,920) (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 33,484   160,572
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 689,048 (869,422) (2,205,464)
Purchased in-process research and development-Nanoconduction     2,685,208
Stock-based compensation 421,268 732,244 12,761,332
Depreciation and amortization 878,391 136,570 6,538,702
Amortization (accretion) of note discounts, net 6,285 15,469 (1,653)
Gain on sale of stock in subsidiary     (2,292,800)
Equity in income (loss) of unconsolidated affiliates 170,788 26,000 894,041
Noncontrolling interest (450,176) 398 (18,284,666)
Changes in operating assets and liabilities:      
Receivables 149,570   86,755
Other receivables (698,224) (395,562) (2,303,187)
Prepaid expenses (185,341) (42,768) (327,909)
Other current assets     (96,360)
Deposits   (32,759) (36,795)
Accounts payable 224,495 (172,011) 430,929
Accrued expenses 398,787 (185,545) 933,327
Accrued severance and other liabilities 837,234 15,449 1,085,099
NET CASH USED IN OPERATING ACTIVITIES OF CONTINUING OPERATIONS (6,862,442) (5,026,015) (67,400,148)
CASH FLOWS FROM INVESTING ACTIVITIES OF CONTINUING OPERATIONS:      
Purchase of marketable securities-US Treasury Bills     (18,575,915)
Purchase of property and equipment (277,240) (5,880) (3,842,839)
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 509,009 589,696 3,313,609
Proceeds from sale of subsidiaries     359,375
Proceeds from sale of fixed assets 6,528   148,903
Payment for patents     (303,440)
Restricted cash     50,773
Cash transferred in acquisition/divestitures 100,035 (1,700,398) (1,600,363)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES OF CONTINUING OPERATIONS 338,332 (1,116,582) (3,432,038)
CASH FLOWS FROM FINANCING ACTIVITIES OF CONTINUING OPERATIONS:      
Principal payments on capital leases (91,598)   (91,598)
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 2,696,333 1,762,436 97,991,113
NET CASH PROVIDED BY FINANCING ACTIVITIES OF CONTINUING OPERATIONS 2,612,735 1,762,436 121,318,082
Cash flows from discontinued operations:      
Operating cash flows (902) 2,322,598 (46,004,409)
Investing cash flows     790,625
Financing cash flows     (1,677,000)
Net cash provided by (used in) discontinued operations (902) 2,322,598 (46,890,784)
NET INCREASE (DECREASE) IN CASH (3,912,277) (2,057,563) 3,595,112
CASH AT BEGINNING OF PERIOD 7,507,389 6,847,162  
CASH AT END OF PERIOD 3,595,112 4,789,599 3,595,112
Supplementary disclosures:      
Interest paid 22,853 105,000 253,272
Taxes paid   $ 742,500 $ 742,500