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Consolidated Statements Of Cash Flows (USD $)
 9 Months Ended 99 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ (545,461) $ (4,642,822) $ (128,595,344)
Net (income) loss attributable to noncontrolling interests 193,099 872,880 17,664,075
Net income (loss) attributable to Arrowhead (352,362) (3,769,942) (110,931,269)
(Income) loss from discontinued operations (5,292,971) 1,953,288 42,837,612
Realized and unrealized (gain) loss on investments 138,486   (943,777)
(Gain) loss from sale of subsidiary     (306,344)
Loss on sale/donation of fixed assets     127,088
Stock issued as gift     298,750
Stock issued for professional services     248,997
Stock issued for in-process research and development     13,166,347
Change in value of derivatives (1,243,156) (1,552,228) (3,004,541)
Purchased in-process research and development - Nanoconduction     2,685,208
Stock-based compensation 1,078,951   12,042,095
Depreciation and amortization 203,041 209,450 5,595,375
Amortization (accretion) of note discounts, net (12,487)   (12,487)
Gain on sale of stock in subsidiary     (2,292,800)
Non-cash (gain) loss from equity investment 96,367 165,727 656,440
Noncontrolling interest (193,099) (872,880) (17,664,075)
Gain on renegotiation of accrued severance     (726,500)
Changes in operating assets and liabilities:      
Receivables     (62,815)
Other receivables (477,770) (728,806) (1,346,480)
Prepaid expenses 5,186 27,944 (236,388)
Other current assets 18,472 (68,950) (96,361)
Deposits   60,105 (36,795)
Accounts payable 81,554 303,854 130,909
Accrued expenses (91,058) 187,902 (9,361)
Accrued severance and other liabilities 47,798 20,775 1,006,412
NET CASH USED IN OPERATING ACTIVITIES OF CONTINUING OPERATIONS (5,993,049) (3,168,363) (58,874,761)
CASH FLOWS FROM INVESTING ACTIVITIES OF CONTINUING OPERATIONS:      
Purchase of marketable securities - US Treasury Bills     (18,575,915)
Purchase of property and equipment (9,674)   (3,565,599)
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 1,130,307   2,400,220
Proceeds from sale of subsidiaries 254,275   359,375
Proceeds from sale of fixed assets     142,375
Payment for patents     (303,440)
Restricted cash     50,773
Cash transferred in sale of subsidiary (1,700,398)   (1,700,398)
NET CASH USED IN INVESTING ACTIVITIES OF CONTINUING OPERATIONS (579,765)   (4,174,750)
CASH FLOWS FROM FINANCING ACTIVITIES OF CONTINUING OPERATIONS:      
Proceeds from issuance of Calando debt     2,516,467
Proceeds from sale of stock in subsidiary 1,719,158   20,894,326
Proceeds from issuance of common stock and warrants, net 57,163 12,071,255 90,844,554
NET CASH PROVIDED BY FINANCING ACTIVITIES OF CONTINUING OPERATIONS 1,776,321 12,071,255 114,255,347
Cash flows from discontinued operations:      
Operating cash flows 2,265,639 (2,017,982) (46,003,153)
Investing cash flows   430,000 790,625
Financing cash flows   (351,689) (1,677,000)
Net cash provided by (used in) discontinued operations: 2,265,639 (1,939,671) (46,889,528)
NET INCREASE (DECREASE) IN CASH (2,530,854) 6,963,221 4,316,308
CASH AT BEGINNING OF PERIOD 6,847,162 2,020,224  
CASH AT END OF PERIOD 4,316,308 8,983,445 4,316,308
Supplementary disclosures:      
Interest paid 105,000 26,406 230,419
Taxes paid $ 742,500   $ 742,500