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Consolidated Balance Sheets (USD $)
Jun. 30, 2011
Sep. 30, 2010
CURRENT ASSETS    
Cash and cash equivalents $ 4,316,308 $ 6,847,162
Trade receivable, net of allowance for doubtful accounts of $90,789 at September 30, 2010   58,864
Other receivables 1,349,898 871,819
Prepaid expenses and other current assets 204,642 353,930
Marketable securities 1,177,708  
TOTAL CURRENT ASSETS 7,048,556 8,131,775
PROPERTY AND EQUIPMENT    
Computers, office equipment and furniture 285,266 335,784
Research equipment 3,515 752,850
Software 77,020 150,445
Leasehold improvements   78,594
Property, Plant and Equipment, Gross, Total 365,801 1,317,673
Less: Accumulated depreciation and amortization (335,880) (1,176,404)
PROPERTY AND EQUIPMENT, NET 29,921 141,269
OTHER ASSETS    
Rent deposit   34,735
Patents 1,791,662 2,046,836
Note Receivable, net 2,231,509  
Derivative asset 284,625  
Investment in Nanotope Inc., equity basis 1,716,561 1,812,927
Investment in Leonardo Biosystems Inc., at cost 187,000 187,000
TOTAL OTHER ASSETS 6,211,357 4,081,498
TOTAL ASSETS 13,289,834 12,354,542
CURRENT LIABILITIES    
Accounts payable 501,278 681,563
Accrued expenses 472,279 494,736
Accrued payroll and benefits 227,696 191,425
Derivative liabilities 958,451 2,408,522
Note payable   500,000
TOTAL CURRENT LIABILITIES 2,159,704 4,276,246
LONG-TERM LIABILITIES    
Note payable 560,878  
TOTAL LONG-TERM LIABILITIES 560,878  
Commitments and contingencies    
STOCKHOLDERS' EQUITY    
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding    
Common stock, $0.001 par value; 145,000,000 shares authorized; 71,833,693 and 71,720,137 shares issued and outstanding as of June 30, 2011 and September 30, 2010, respectively 71,849 71,735
Additional paid-in capital 121,649,155 119,716,834
Accumulated deficit during the development stage (111,095,229) (110,742,867)
Total Arrowhead Research Corporation stockholders' equity 10,625,775 9,045,702
Noncontrolling interest (56,523) (967,406)
TOTAL STOCKHOLDERS' EQUITY 10,569,252 8,078,296
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 13,289,834 $ 12,354,542