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Consolidated Statement Of Stockholders' Equity (USD $)
3 Months Ended 12 Months Ended 104 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Sep. 30, 2008
Sep. 30, 2007
Sep. 30, 2006
Sep. 30, 2005
Sep. 30, 2004
Sep. 30, 2003
Dec. 31, 2011
Stock issued during period, value, new issues $ 525,000 $ 43,279 $ 1,066,051         $ 50,000 $ (150,469)    
Reclassification of former Unidym mezzanine debt to equity       2,000,000              
Stock issuance cost charged to additional paid-in capital                 (991,318)    
Net loss attributable to Arrowhead (2,686,799) (3,492,399) (6,957,038) (19,308,392) (27,241,639) (30,712,947) (19,961,961) (6,733,427) (751,255) (95,238) (134,229,081)
Stock issued during period, value, stock options exercised 23,833 13,884 7,631   290,027 434,727 341,537   15,000    
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition, value 251,878 1,404,640 1,582,149 2,676,170 3,187,397 2,175,544 1,369,478 508,513 175,653    
Adjustments to additional paid in capital, reallocation of noncontrolling interest     300,000 16,297 1,720,962     230,087      
Issuance of preferred stock in subsidiary   1,618,509 300,000                
Divestiture of Unidym   254,275                  
Net loss attributable to Arrowhead (2,485,505)                   (116,193,297)
Balance 15,748,910 12,564,168 8,078,296 4,857,936 12,302,609 26,456,577 31,605,644 28,026,657 11,227,149 1,419,762 15,748,910
Common Stock [Member] | Issued For Cash At $0.01 Per Unit [Member]
                     
Stock issued during period, value, new issues                   3,000  
Stock issued during period, shares, new issues                   300,000  
Common Stock [Member] | Issued For Cash At $10.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 475 1,680  
Stock issued during period, shares, new issues                 47,500 168,000  
Common Stock [Member] | Issued For Marketable Securities At $10.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 500    
Stock issued during period, shares, new issues                 50,000    
Common Stock [Member] | Issued For Cash At $15.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 6,609    
Stock issued during period, shares, new issues                 660,879    
Common Stock [Member] | Issued as a Gift for $10.90 Per Share [Member]
                     
Stock issued during period, value, new issues                 163    
Stock issued during period, shares, new issues                 15,000    
Common Stock [Member] | Issued As Stock Issuance Cost At $15.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 356    
Stock issued during period, shares, new issues                 35,623    
Common Stock [Member] | Exercised At $2.00 Per Share [Member]
                     
Stock issued during period, value, stock options exercised                 75    
Stock issued during period, shares, stock options exercised                 7,500    
Common Stock [Member] | Exercised At $10.00 Per Share [Member]
                     
Stock issued during period, value, new issues               25      
Stock issued during period, shares, new issues               2,500      
Stock issued during period, value, stock options exercised                 6    
Stock issued during period, shares, stock options exercised                 600    
Common Stock [Member] | Exercised At $15.00 Per Share [Member]
                     
Stock issued during period, value, new issues               13,813      
Stock issued during period, shares, new issues               1,381,289      
Common Stock [Member] | Issued To Purchase Insert Therapeutics Share At $39.80 Per Share [Member]
                     
Stock issued during period, value, new issues               502      
Stock issued during period, shares, new issues               50,226      
Common Stock [Member] | Issued At $48.80 Per Share [Member]
                     
Stock issued during period, value, new issues             205        
Stock issued during period, shares, new issues             20,485        
Common Stock [Member] | Issued At $38.40 Per Share [Member]
                     
Stock issued during period, value, new issues             15        
Stock issued during period, shares, new issues             1,500        
Common Stock [Member] | Issued At $35.00 Per Share [Member]
                     
Stock issued during period, value, new issues             5,590        
Stock issued during period, shares, new issues             559,000        
Common Stock [Member] | Issued At $59.10 Per Share [Member]
                     
Stock issued during period, value, new issues             25        
Stock issued during period, shares, new issues             2,536        
Common Stock [Member] | Issued To Purchase Calando Pharmaceuticals Inc At $51.70 Per Share [Member]
                     
Stock issued during period, value, new issues             208        
Stock issued during period, shares, new issues             20,838        
Common Stock [Member] | Issued At $57.80 Per Share [Member]
                     
Stock issued during period, value, new issues           2,849          
Stock issued during period, shares, new issues           284,945          
Common Stock [Member] | Issued For Purchase Of Carbon Nanotechnologies Inc At $37.70 Per Share [Member]
                     
Stock issued during period, value, new issues           1,431          
Stock issued during period, shares, new issues           143,122          
Common Stock [Member] | Issued At Approximately $18.00 Per Share Net [Member]
                     
Stock issued during period, value, new issues         3,867            
Stock issued during period, shares, new issues         386,399            
Common Stock [Member] | Issued At $27.20 Per Share To Rice University [Member]
                     
Stock issued during period, value, new issues         50            
Stock issued during period, shares, new issues         5,000            
Common Stock [Member] | Issued At $28.30 Per Share To Purchase Shares Of Unidym Inc [Member]
                     
Stock issued during period, value, new issues         71            
Stock issued during period, shares, new issues         7,055            
Common Stock [Member] | Issued At $29.50 per Share To Purchase MASA Energy LLC [Member]
                     
Stock issued during period, value, new issues         105            
Stock issued during period, shares, new issues         10,505            
Common Stock [Member] | Issued At $21.90 Per Share To Unidym For The Acquisition Of Nanoconduction [Member]
                     
Stock issued during period, value, new issues         114            
Stock issued during period, shares, new issues         11,416            
Common Stock [Member] | Issued At $21.80 Per Share [Member]
                     
Stock issued during period, value, new issues         15            
Stock issued during period, shares, new issues         1,500            
Common Stock [Member] | Issued At $5.50 Per Share To Unidym Stockholder In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues       2,059              
Stock issued during period, shares, new issues       205,839              
Common Stock [Member] | Issued At $5.20 Per Share To TEL Ventures In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues       2,222              
Stock issued during period, shares, new issues       222,222              
Common Stock [Member] | Issued At $3.00 Per Share [Member]
                     
Stock issued during period, value, new issues       9,197              
Stock issued during period, shares, new issues       919,664              
Common Stock [Member] | Issued At $6.30 Per Share [Member]
                     
Stock issued during period, value, new issues     5,083                
Stock issued during period, shares, new issues     508,343                
Common Stock [Member] | Issued At $13.12 Per Share [Member]
                     
Stock issued during period, value, new issues     6,593                
Stock issued during period, shares, new issues     659,299                
Common Stock [Member] | Issued At $3.80 Per Share [Member]
                     
Stock issued during period, value, new issues   14,574                  
Stock issued during period, shares, new issues   1,458,917                  
Common Stock [Member] | Issued At $3.70 Per Share [Member]
                     
Stock issued during period, value, new issues 6,750                    
Stock issued during period, shares, new issues 675,000                    
Common Stock [Member] | Issued at $4.00 Per Share [Member]
                     
Stock issued during period, value, new issues 1,000                    
Stock issued during period, shares, new issues 100,000                    
Common Stock [Member] | Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues     153                
Stock issued during period, shares, new issues     15,318                
Common Stock [Member] | Issued To Calando Stockholders In Exchange For Calando's Shares [Member]
                     
Stock issued during period, value, new issues     1,220                
Stock issued during period, shares, new issues     122,000                
Common Stock [Member] | Issued In Acquisition [Member]
                     
Stock issued during period, value, new issues 9,017                    
Stock issued during period, shares, new issues 901,702                    
Common Stock [Member] | Issued Under Committed Capital Agreement [Member]
                     
Stock issued during period, value, new issues 689                    
Stock issued during period, shares, new issues 68,926                    
Common Stock [Member]
                     
Stock issued during period, value, new issues 1,382 87 2,251         12 706    
Stock issued during period, shares, new issues 138,158 8,656 225,189         1,250 70,553    
Stock issued during period, value, stock options exercised 45 27 7   106 186 116   75    
Stock issued during period, shares, stock options exercised 4,583 2,700 688   10,536 18,616 11,579   7,500    
Fractional shares redeemed in reverse stock split (131)                    
Balance 105,306 86,423 71,735 56,428 42,950 38,622 34,156 27,997 13,645 4,680 105,306
Balance, shares 10,530,524 8,642,286 7,172,014 5,641,177 4,293,452 3,861,042 3,414,359 2,798,419 1,363,155 468,000 10,530,524
Preferred Stock [Member] | Preferred Stock Issued At $1,000 Per Share [Member]
                     
Stock issued during period, value, new issues 1                    
Stock issued during period, shares, new issues 1,015                    
Preferred Stock [Member]
                     
Balance 1                   1
Balance, shares 1,015                   1,015
Additional Paid-In Capital [Member] | Issued For Cash At $10.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 474,525 1,678,320  
Additional Paid-In Capital [Member] | Issued For Marketable Securities At $10.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 499,500    
Additional Paid-In Capital [Member] | Issued For Cash At $15.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 9,906,573    
Additional Paid-In Capital [Member] | Stock Issuance Cost Charged To Additional Paid In Capital [Member]
                     
Stock issuance cost charged to additional paid-in capital                 (96,500) (168,000)  
Additional Paid-In Capital [Member] | Arrowheads Increase In Proportionate Share Of Insert Therapeutics Equity [Member]
                     
Adjustments to additional paid in capital, reallocation of noncontrolling interest           2,401,394          
Additional Paid-In Capital [Member] | Arrowheads Increase In Proportionate Share Of Calando's Equity [Member]
                     
Adjustments to additional paid in capital, reallocation of noncontrolling interest       2,120,250              
Additional Paid-In Capital [Member] | Issued as a Gift for $10.90 Per Share [Member]
                     
Stock issued during period, value, new issues                 162,587    
Additional Paid-In Capital [Member] | Issued As Stock Issuance Cost At $15.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 533,988    
Additional Paid-In Capital [Member] | Exercised At $2.00 Per Share [Member]
                     
Stock issued during period, value, stock options exercised                 14,925    
Additional Paid-In Capital [Member] | Exercised At $10.00 Per Share [Member]
                     
Stock issued during period, value, new issues               24,975      
Stock issued during period, value, stock options exercised                 5,994    
Additional Paid-In Capital [Member] | Exercised At $15.00 Per Share [Member]
                     
Stock issued during period, value, new issues               20,705,522      
Additional Paid-In Capital [Member] | Issued To Purchase Insert Therapeutics Share At $39.80 Per Share [Member]
                     
Stock issued during period, value, new issues               1,999,498      
Additional Paid-In Capital [Member] | Issued At $48.80 Per Share [Member]
                     
Stock issued during period, value, new issues             999,795        
Additional Paid-In Capital [Member] | Issued At $38.40 Per Share [Member]
                     
Stock issued during period, value, new issues             57,585        
Additional Paid-In Capital [Member] | Issued At $35.00 Per Share [Member]
                     
Stock issued during period, value, new issues             19,539,410        
Additional Paid-In Capital [Member] | Issued At $59.10 Per Share [Member]
                     
Stock issued during period, value, new issues             149,975        
Additional Paid-In Capital [Member] | Issued To Purchase Calando Pharmaceuticals Inc At $51.70 Per Share [Member]
                     
Stock issued during period, value, new issues             1,077,125        
Additional Paid-In Capital [Member] | Issued At $57.80 Per Share [Member]
                     
Stock issued during period, value, new issues           15,149,366          
Additional Paid-In Capital [Member] | Issued For Purchase Of Carbon Nanotechnologies Inc At $37.70 Per Share [Member]
                     
Stock issued during period, value, new issues           5,398,569          
Additional Paid-In Capital [Member] | Issued At Approximately $18.00 Per Share Net [Member]
                     
Stock issued during period, value, new issues         6,956,718            
Additional Paid-In Capital [Member] | Issued At $27.20 Per Share To Rice University [Member]
                     
Stock issued during period, value, new issues         135,950            
Additional Paid-In Capital [Member] | Issued At $28.30 Per Share To Purchase Shares Of Unidym Inc [Member]
                     
Stock issued during period, value, new issues         199,929            
Additional Paid-In Capital [Member] | Issued At $29.50 per Share To Purchase MASA Energy LLC [Member]
                     
Stock issued during period, value, new issues         309,895            
Additional Paid-In Capital [Member] | Issued At $21.90 Per Share To Unidym For The Acquisition Of Nanoconduction [Member]
                     
Stock issued during period, value, new issues         249,886            
Additional Paid-In Capital [Member] | Issued At $21.80 Per Share [Member]
                     
Stock issued during period, value, new issues         32,685            
Additional Paid-In Capital [Member] | Issued At $5.50 Per Share To Unidym Stockholder In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues       1,131,617              
Additional Paid-In Capital [Member] | Issued At $5.20 Per Share To TEL Ventures In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues       1,156,111              
Additional Paid-In Capital [Member] | Issued At $3.00 Per Share [Member]
                     
Stock issued during period, value, new issues       2,749,796              
Additional Paid-In Capital [Member] | Issued At $6.30 Per Share [Member]
                     
Stock issued during period, value, new issues     3,217,813                
Additional Paid-In Capital [Member] | Issued At $13.12 Per Share [Member]
                     
Stock issued during period, value, new issues     3,692,078                
Additional Paid-In Capital [Member] | Issued At $3.80 Per Share [Member]
                     
Stock issued during period, value, new issues   4,629,110                  
Additional Paid-In Capital [Member] | Issued At $3.70 Per Share [Member]
                     
Stock issued during period, value, new issues 2,490,750                    
Additional Paid-In Capital [Member] | Issued at $4.00 Per Share [Member]
                     
Stock issued during period, value, new issues 399,000                    
Additional Paid-In Capital [Member] | Issuance Of Common Stock For Subscription [Member]
                     
Stock issued during period, value, new issues   900,000                  
Additional Paid-In Capital [Member] | Series D Preferred Stock Issued For Subscription In Unidym [Member]
                     
Issuance of preferred stock in subsidiary       300,000              
Additional Paid-In Capital [Member] | Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues     (1,435)                
Additional Paid-In Capital [Member] | Issued To Calando Stockholders In Exchange For Calando's Shares [Member]
                     
Stock issued during period, value, new issues     (160,667)                
Additional Paid-In Capital [Member] | Issued In Acquisition [Member]
                     
Stock issued during period, value, new issues 4,138,813                    
Additional Paid-In Capital [Member] | Issued Under Committed Capital Agreement [Member]
                     
Stock issued during period, value, new issues (689)                    
Additional Paid-In Capital [Member] | Preferred Stock Issued At $1,000 Per Share [Member]
                     
Stock issued during period, value, new issues 1,014,999                    
Additional Paid-In Capital [Member]
                     
Stock issued during period, value, new issues 523,618 43,192 1,063,600         49,988 (151,175)    
Reclassification of former Unidym mezzanine debt to equity       2,000,000              
Stock issuance cost charged to additional paid-in capital                 (991,318)    
Stock issued during period, value, stock options exercised 23,788 13,857 7,624   289,921 434,541 341,421   14,925    
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition, value 251,878 1,404,640 1,582,149 2,676,170 3,187,397 2,175,544 1,369,478 508,513 175,653    
Adjustments to additional paid in capital, reallocation of noncontrolling interest   (849,707) 245,345 16,297 1,720,962     230,087      
Issuance of preferred stock in subsidiary   1,618,509                  
Amortization of discount on Unidym Series D Preferred Stock       163,960              
Balance 136,318,592 127,476,435 119,716,834 110,070,327 97,756,126 84,672,783 59,113,369 35,578,580 12,059,997 1,510,320 136,318,592
Subscription Receivable [Member] | Issued At $3.70 Per Share [Member]
                     
Stock issued during period, value, new issues (2,497,500)                    
Subscription Receivable [Member] | Issuance Of Common Stock For Subscription [Member]
                     
Stock issued during period, value, new issues   (900,000)                  
Subscription Receivable [Member] | Series D Preferred Stock Issued For Subscription In Unidym [Member]
                     
Issuance of preferred stock in subsidiary       (300,000)              
Subscription Receivable [Member] | Preferred Stock Issued At $1,000 Per Share [Member]
                     
Stock issued during period, value, new issues (500,000)                    
Subscription Receivable [Member]
                     
Issuance of preferred stock in subsidiary     300,000                
Balance (3,897,500) (900,000)   (300,000)             (3,897,500)
Accumulated Deficit During The Development Stage [Member]
                     
Net loss attributable to Arrowhead (2,485,505) (3,128,885) (5,774,048) (19,308,392) (27,089,030) (29,931,118) (18,997,209) (6,854,918) (2,528,954) (95,238)  
Amortization of discount on Unidym Series D Preferred Stock       (163,960)              
Balance (116,357,257) (113,871,752) (110,742,867) (104,968,819) (85,496,467) (58,407,437) (28,476,319) (9,479,110) (2,624,192) (95,238) (116,357,257)
Noncontrolling Interest [Member] | Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues     1,282                
Noncontrolling Interest [Member] | Issued To Calando Stockholders In Exchange For Calando's Shares [Member]
                     
Stock issued during period, value, new issues     159,447                
Stock issued during period, value, stock options exercised 8,000                    
Noncontrolling Interest [Member]
                     
Stock issued during period, value, new issues     200                
Net loss attributable to Arrowhead (201,294) (363,514) (1,182,990)   (152,609) (781,829) (964,752) 121,491 1,777,699    
Adjustments to additional paid in capital, reallocation of noncontrolling interest   849,707 54,655                
Divestiture of Unidym   254,275                  
Balance (420,232) (226,938) (967,406)     152,609 934,438 1,899,190 1,777,699   (420,232)
Issued For Cash At $0.01 Per Unit [Member]
                     
Stock issued during period, value, new issues                   3,000  
Issued For Cash At $10.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 475,000 1,680,000  
Issued For Marketable Securities At $10.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 500,000    
Issued For Cash At $15.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 9,913,182    
Stock Issuance Cost Charged To Additional Paid In Capital [Member]
                     
Stock issuance cost charged to additional paid-in capital                 (96,500) (168,000)  
Arrowheads Increase In Proportionate Share Of Insert Therapeutics Equity [Member]
                     
Adjustments to additional paid in capital, reallocation of noncontrolling interest           2,401,394          
Arrowheads Increase In Proportionate Share Of Calando's Equity [Member]
                     
Adjustments to additional paid in capital, reallocation of noncontrolling interest       2,120,250              
Issued as a Gift for $10.90 Per Share [Member]
                     
Stock issued during period, value, new issues                 162,750    
Issued As Stock Issuance Cost At $15.00 Per Unit [Member]
                     
Stock issued during period, value, new issues                 534,344    
Exercised At $2.00 Per Share [Member]
                     
Stock issued during period, value, stock options exercised                 15,000    
Exercised At $10.00 Per Share [Member]
                     
Stock issued during period, value, new issues               25,000      
Stock issued during period, value, stock options exercised                 6,000    
Exercised At $15.00 Per Share [Member]
                     
Stock issued during period, value, new issues               20,719,335      
Issued To Purchase Insert Therapeutics Share At $39.80 Per Share [Member]
                     
Stock issued during period, value, new issues               2,000,000      
Issued At $48.80 Per Share [Member]
                     
Stock issued during period, value, new issues             1,000,000        
Issued At $38.40 Per Share [Member]
                     
Stock issued during period, value, new issues             57,600        
Issued At $35.00 Per Share [Member]
                     
Stock issued during period, value, new issues             19,545,000        
Issued At $59.10 Per Share [Member]
                     
Stock issued during period, value, new issues             150,000        
Issued To Purchase Calando Pharmaceuticals Inc At $51.70 Per Share [Member]
                     
Stock issued during period, value, new issues             1,077,333        
Issued At $57.80 Per Share [Member]
                     
Stock issued during period, value, new issues           15,152,215          
Issued For Purchase Of Carbon Nanotechnologies Inc At $37.70 Per Share [Member]
                     
Stock issued during period, value, new issues           5,400,000          
Issued At Approximately $18.00 Per Share Net [Member]
                     
Stock issued during period, value, new issues         6,960,585            
Issued At $27.20 Per Share To Rice University [Member]
                     
Stock issued during period, value, new issues         136,000            
Issued At $28.30 Per Share To Purchase Shares Of Unidym Inc [Member]
                     
Stock issued during period, value, new issues         200,000            
Issued At $29.50 per Share To Purchase MASA Energy LLC [Member]
                     
Stock issued during period, value, new issues         310,000            
Issued At $21.90 Per Share To Unidym For The Acquisition Of Nanoconduction [Member]
                     
Stock issued during period, value, new issues         250,000            
Issued At $21.80 Per Share [Member]
                     
Stock issued during period, value, new issues         32,700            
Issued At $5.50 Per Share To Unidym Stockholder In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues       1,133,676              
Issued At $5.20 Per Share To TEL Ventures In Exchange For Unidym's Shares [Member]
                     
Stock issued during period, value, new issues       1,158,333              
Issued At $3.00 Per Share [Member]
                     
Stock issued during period, value, new issues       2,758,993              
Issued At $6.30 Per Share [Member]
                     
Stock issued during period, value, new issues     3,222,896                
Issued At $13.12 Per Share [Member]
                     
Stock issued during period, value, new issues     3,698,671                
Issued At $3.80 Per Share [Member]
                     
Stock issued during period, value, new issues   4,643,684                  
Issued at $4.00 Per Share [Member]
                     
Stock issued during period, value, new issues 400,000                    
Issued To Calando Stockholders In Exchange For Calando's Shares [Member]
                     
Stock issued during period, value, stock options exercised 8,000                    
Issued In Acquisition [Member]
                     
Stock issued during period, value, new issues 4,147,830                    
Preferred Stock Issued At $1,000 Per Share [Member]
                     
Stock issued during period, value, new issues $ 515,000