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Consolidated Statements Of Cash Flows (USD $)
 12 Months Ended 101 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (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)
(Income) loss from discontinued operations (5,292,609) 2,645,051 42,837,974
Realized and unrealized (gain) loss on investments 261,218   (821,045)
(Gain) loss from sale of subsidiary     (306,344)
Loss on sale/donation of fixed assets   (1,772) 127,088
Stock issued as gift     298,750
Stock issued for professional services 193,885   442,882
Stock issued for in-process research and development     13,166,347
Change in value of derivatives (1,133,127) (1,761,385) (2,894,512)
Purchased in-process research and development - Nanoconduction     2,685,208
Stock-based compensation 1,376,921 1,424,293 12,340,064
Depreciation and amortization 267,977 277,650 5,660,311
Amortization (accretion) of note discounts, net (7,938)   (7,938)
Gain on sale of stock in subsidiary     (2,292,800)
Non-cash (gain) loss from equity investment 163,180 219,540 723,253
Noncontrolling interest (363,514) (1,182,990) (17,834,490)
Gain on renegotiation of accrued severance     (726,500)
Changes in operating assets and liabilities:      
Receivables     (62,815)
Other receivables (736,253) (872,128) (1,604,963)
Prepaid expenses 99,006 110,152 (142,568)
Other current assets 18,473 (114,833) (96,360)
Deposits   60,105 (36,795)
Accounts payable 157,079 (203,253) 206,434
Accrued expenses 452,843 110,873 534,540
Accrued severance and other liabilities 15,751 7,556 974,365
NET CASH USED IN OPERATING ACTIVITIES OF CONTINUING OPERATIONS (7,655,993) (5,053,417) (60,537,706)
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 1,534,687   2,804,600
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 sale of subsidiary (1,700,398)    (1,700,398)
NET CASH USED IN INVESTING ACTIVITIES OF CONTINUING OPERATIONS (175,385)   (3,770,370)
CASH FLOWS FROM FINANCING ACTIVITIES OF CONTINUING OPERATIONS:      
Proceeds from issuance of Calando debt     2,516,467
Proceeds from sale of stock in subsidiary 1,718,932   20,894,100
Proceeds from issuance of common stock and warrants, net 4,507,389 12,165,156 95,294,780
NET CASH PROVIDED BY FINANCING ACTIVITIES OF CONTINUING OPERATIONS 6,226,321 12,165,156 118,705,347
Cash flows from discontinued operations:      
Operating cash flows 2,265,284 (2,645,860) (46,003,507)
Investing cash flows   487,593 790,625
Financing cash flows   (126,534) (1,677,000)
Net cash provided by (used in) discontinued operations: 2,265,284 (2,284,801) (46,889,882)
NET INCREASE IN CASH 660,227 4,826,938 7,507,389
CASH AT BEGINNING OF PERIOD 6,847,162 2,020,224  
CASH AT END OF PERIOD 7,507,389 6,847,162 7,507,389
Supplementary disclosures:      
Interest paid 105,000   230,419
Taxes paid $ 742,500   $ 742,500