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Consolidated Statement Of Stockholders' Equity (USD $)	12 Months Ended									101 Months Ended
	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	Sep. 30, 2011
Stock issued during period, value, new issues	$ 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	(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)	(131,542,282)
Stock issued during period, value, stock options exercised	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	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
Amortization of discount on Unidym Series D Preferred Stock
Stockholders' equity, including portion attributable to noncontrolling interest, ending balance	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	12,564,168
Divestiture of Unidym	254,275
Net loss attributable to Arrowhead	(3,128,885)	(5,774,048)								(113,707,792)
Issued For Cash At $0.01 Per Unit [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued For Cash At $0.01 Per Unit [Member] | Common Stock [Member]
Stock issued during period, value, new issues									3,000
Stock issued during period, shares, new issues									300,000
Issued For Cash At $0.01 Per Unit [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues
Issued For Cash At $0.01 Per Unit [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued For Cash At $0.01 Per Unit [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued For Cash At $10.00 Per Unit [Member] | Common Stock [Member]
Stock issued during period, value, new issues								475	1,680
Stock issued during period, shares, new issues								47,500	168,000
Issued For Cash At $10.00 Per Unit [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues								474,525	1,678,320
Issued For Cash At $10.00 Per Unit [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued For Cash At $10.00 Per Unit [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued For Marketable Securities At $10.00 Per Unit [Member] | Common Stock [Member]
Stock issued during period, value, new issues								500
Stock issued during period, shares, new issues								50,000
Issued For Marketable Securities At $10.00 Per Unit [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues								499,500
Issued For Marketable Securities At $10.00 Per Unit [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued For Marketable Securities At $10.00 Per Unit [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued For Cash At $15.00 Per Unit [Member] | Common Stock [Member]
Stock issued during period, value, new issues								6,609
Stock issued during period, shares, new issues								660,879
Issued For Cash At $15.00 Per Unit [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues								9,906,573
Issued For Cash At $15.00 Per Unit [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued For Cash At $15.00 Per Unit [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issuance cost charged to additional paid-in capital
Stock Issuance Cost Charged To Additional Paid In Capital [Member] | Common Stock [Member]
Stock issuance cost charged to additional paid-in capital
Stock Issuance Cost Charged To Additional Paid In Capital [Member] | Additional Paid-In Capital [Member]
Stock issuance cost charged to additional paid-in capital								(96,500)	(168,000)
Stock Issuance Cost Charged To Additional Paid In Capital [Member] | Retained Earnings [Member]
Stock issuance cost charged to additional paid-in capital
Stock Issuance Cost Charged To Additional Paid In Capital [Member] | Noncontrolling Interest [Member]
Stock issuance cost charged to additional paid-in capital
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] | Subscription Receivable [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Arrowheads Increase In Proportionate Share Of Insert Therapeutics Equity [Member] | Common Stock [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Arrowheads Increase In Proportionate Share Of Insert Therapeutics Equity [Member] | Additional Paid-In Capital [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest					2,401,394
Arrowheads Increase In Proportionate Share Of Insert Therapeutics Equity [Member] | Retained Earnings [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Arrowheads Increase In Proportionate Share Of Insert Therapeutics Equity [Member] | Noncontrolling Interest [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest
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] | Subscription Receivable [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Arrowheads Increase In Proportionate Share Of Calando's Equity [Member] | Common Stock [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Arrowheads Increase In Proportionate Share Of Calando's Equity [Member] | Additional Paid-In Capital [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest			2,120,250
Arrowheads Increase In Proportionate Share Of Calando's Equity [Member] | Retained Earnings [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Arrowheads Increase In Proportionate Share Of Calando's Equity [Member] | Noncontrolling Interest [Member]
Adjustments to additional paid in capital, reallocation of noncontrolling interest
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued as a Gift for $10.90 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues								163
Stock issued during period, shares, new issues								15,000
Issued as a Gift for $10.90 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues								162,587
Issued as a Gift for $10.90 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued as a Gift for $10.90 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued As Stock Issuance Cost At $15.00 Per Unit [Member] | Common Stock [Member]
Stock issued during period, value, new issues								356
Stock issued during period, shares, new issues								35,623
Issued As Stock Issuance Cost At $15.00 Per Unit [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues								533,988
Issued As Stock Issuance Cost At $15.00 Per Unit [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued As Stock Issuance Cost At $15.00 Per Unit [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, stock options exercised
Exercised At $2.00 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, stock options exercised								75
Stock issued during period, shares, stock options exercised								7,500
Exercised At $2.00 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, stock options exercised								14,925
Exercised At $2.00 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, stock options exercised
Exercised At $2.00 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, stock options exercised
Exercised At $2.00 Per Share [Member]
Stock issued during period, value, stock options exercised								15,000
Exercised At $10.00 Per Share [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Stock issued during period, value, stock options exercised
Exercised At $10.00 Per Share [Member] | Common Stock [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
Exercised At $10.00 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues							24,975
Stock issued during period, value, stock options exercised								5,994
Exercised At $10.00 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Stock issued during period, value, stock options exercised
Exercised At $10.00 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Stock issued during period, value, stock options exercised
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Exercised At $15.00 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues							13,813
Stock issued during period, shares, new issues							1,381,289
Exercised At $15.00 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues							20,705,522
Exercised At $15.00 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Exercised At $15.00 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued To Purchase Insert Therapeutics Share At $39.80 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues							502
Stock issued during period, shares, new issues							50,226
Issued To Purchase Insert Therapeutics Share At $39.80 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues							1,999,498
Issued To Purchase Insert Therapeutics Share At $39.80 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued To Purchase Insert Therapeutics Share At $39.80 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $48.80 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues						205
Stock issued during period, shares, new issues						20,485
Issued At $48.80 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues						999,795
Issued At $48.80 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $48.80 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Issued At $48.80 Per Share [Member]
Stock issued during period, value, new issues						1,000,000
Issued At $38.40 Per Share [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $38.40 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues						15
Stock issued during period, shares, new issues						1,500
Issued At $38.40 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues						57,585
Issued At $38.40 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $38.40 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Issued At $38.40 Per Share [Member]
Stock issued during period, value, new issues						57,600
Issued At $35.00 Per Share [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $35.00 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues						5,590
Stock issued during period, shares, new issues						559,000
Issued At $35.00 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues						19,539,410
Issued At $35.00 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $35.00 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Issued At $35.00 Per Share [Member]
Stock issued during period, value, new issues						19,545,000
Issued At $59.10 Per Share [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $59.10 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues						25
Stock issued during period, shares, new issues						2,536
Issued At $59.10 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues						149,975
Issued At $59.10 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $59.10 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued To Purchase Calando Pharmaceuticals Inc At $51.70 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues						208
Stock issued during period, shares, new issues						20,838
Issued To Purchase Calando Pharmaceuticals Inc At $51.70 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues						1,077,125
Issued To Purchase Calando Pharmaceuticals Inc At $51.70 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued To Purchase Calando Pharmaceuticals Inc At $51.70 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $57.80 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues					2,849
Stock issued during period, shares, new issues					284,945
Issued At $57.80 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues					15,149,366
Issued At $57.80 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $57.80 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued For Purchase Of Carbon Nanotechnologies Inc At $37.70 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues					1,431
Stock issued during period, shares, new issues					143,122
Issued For Purchase Of Carbon Nanotechnologies Inc At $37.70 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues					5,398,569
Issued For Purchase Of Carbon Nanotechnologies Inc At $37.70 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued For Purchase Of Carbon Nanotechnologies Inc At $37.70 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At Approximately $18.00 Per Share Net [Member] | Common Stock [Member]
Stock issued during period, value, new issues				3,867
Stock issued during period, shares, new issues				386,399
Issued At Approximately $18.00 Per Share Net [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues				6,956,718
Issued At Approximately $18.00 Per Share Net [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At Approximately $18.00 Per Share Net [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $27.20 Per Share To Rice University [Member] | Common Stock [Member]
Stock issued during period, value, new issues				50
Stock issued during period, shares, new issues				5,000
Issued At $27.20 Per Share To Rice University [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues				135,950
Issued At $27.20 Per Share To Rice University [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $27.20 Per Share To Rice University [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $28.30 Per Share To Purchase Shares Of Unidym Inc [Member] | Common Stock [Member]
Stock issued during period, value, new issues				71
Stock issued during period, shares, new issues				7,055
Issued At $28.30 Per Share To Purchase Shares Of Unidym Inc [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues				199,929
Issued At $28.30 Per Share To Purchase Shares Of Unidym Inc [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $28.30 Per Share To Purchase Shares Of Unidym Inc [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $29.50 per Share To Purchase MASA Energy LLC [Member] | Common Stock [Member]
Stock issued during period, value, new issues				105
Stock issued during period, shares, new issues				10,505
Issued At $29.50 per Share To Purchase MASA Energy LLC [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues				309,895
Issued At $29.50 per Share To Purchase MASA Energy LLC [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $29.50 per Share To Purchase MASA Energy LLC [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $21.90 Per Share To Unidym For The Acquisition Of Nanoconduction [Member] | Common Stock [Member]
Stock issued during period, value, new issues				114
Stock issued during period, shares, new issues				11,416
Issued At $21.90 Per Share To Unidym For The Acquisition Of Nanoconduction [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues				249,886
Issued At $21.90 Per Share To Unidym For The Acquisition Of Nanoconduction [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $21.90 Per Share To Unidym For The Acquisition Of Nanoconduction [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $21.80 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues				15
Stock issued during period, shares, new issues				1,500
Issued At $21.80 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues				32,685
Issued At $21.80 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $21.80 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $5.50 Per Share To Unidym Stockholder In Exchange For Unidym's Shares [Member] | Common Stock [Member]
Stock issued during period, value, new issues			2,059
Stock issued during period, shares, new issues			205,839
Issued At $5.50 Per Share To Unidym Stockholder In Exchange For Unidym's Shares [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues			1,131,617
Issued At $5.50 Per Share To Unidym Stockholder In Exchange For Unidym's Shares [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $5.50 Per Share To Unidym Stockholder In Exchange For Unidym's Shares [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $5.20 Per Share To TEL Ventures In Exchange For Unidym's Shares [Member] | Common Stock [Member]
Stock issued during period, value, new issues			2,222
Stock issued during period, shares, new issues			222,222
Issued At $5.20 Per Share To TEL Ventures In Exchange For Unidym's Shares [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues			1,156,111
Issued At $5.20 Per Share To TEL Ventures In Exchange For Unidym's Shares [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $5.20 Per Share To TEL Ventures In Exchange For Unidym's Shares [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
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] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $3.00 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues			9,197
Stock issued during period, shares, new issues			919,664
Issued At $3.00 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues			2,749,796
Issued At $3.00 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $3.00 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Issued At $3.00 Per Share [Member]
Stock issued during period, value, new issues			2,758,993
Issued At $6.30 Per Share [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $6.30 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues		5,083
Stock issued during period, shares, new issues		508,343
Issued At $6.30 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues		3,217,813
Issued At $6.30 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $6.30 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Issued At $6.30 Per Share [Member]
Stock issued during period, value, new issues		3,222,896
Issued At $13.12 Per Share [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $13.12 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues		6,593
Stock issued during period, shares, new issues		659,299
Issued At $13.12 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues		3,692,078
Issued At $13.12 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $13.12 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Issued At $13.12 Per Share [Member]
Stock issued during period, value, new issues		3,698,671
Issued At $3.80 Per Share [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued At $3.80 Per Share [Member] | Common Stock [Member]
Stock issued during period, value, new issues	14,574
Stock issued during period, shares, new issues	1,458,917
Issued At $3.80 Per Share [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues	4,629,110
Issued At $3.80 Per Share [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued At $3.80 Per Share [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Issued At $3.80 Per Share [Member]
Stock issued during period, value, new issues	4,643,684
Issuance Of Common Stock For Subscription [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues	(900,000)
Issuance Of Common Stock For Subscription [Member] | Common Stock [Member]
Stock issued during period, value, new issues
Stock issued during period, shares, new issues
Issuance Of Common Stock For Subscription [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues	900,000
Issuance Of Common Stock For Subscription [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issuance Of Common Stock For Subscription [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues
Issuance Of Common Stock For Subscription [Member]
Stock issued during period, value, new issues
Series D Preferred Stock Issued For Subscription In Unidym [Member] | Subscription Receivable [Member]
Issuance of preferred stock in subsidiary			(300,000)
Series D Preferred Stock Issued For Subscription In Unidym [Member] | Common Stock [Member]
Issuance of preferred stock in subsidiary
Series D Preferred Stock Issued For Subscription In Unidym [Member] | Additional Paid-In Capital [Member]
Issuance of preferred stock in subsidiary			300,000
Series D Preferred Stock Issued For Subscription In Unidym [Member] | Retained Earnings [Member]
Issuance of preferred stock in subsidiary
Series D Preferred Stock Issued For Subscription In Unidym [Member] | Noncontrolling Interest [Member]
Issuance of preferred stock in subsidiary
Series D Preferred Stock Issued For Subscription In Unidym [Member]
Issuance of preferred stock in subsidiary
Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member] | Common Stock [Member]
Stock issued during period, value, new issues		153
Stock issued during period, shares, new issues		15,318
Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues		(1,435)
Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues		1,282
Issued To Unidym Stockholders In Exchange For Unidym's Shares [Member]
Stock issued during period, value, new issues
Issued To Calando Stockholders In Exchange For Calando's Shares [Member] | Subscription Receivable [Member]
Stock issued during period, value, new issues
Issued To Calando Stockholders In Exchange For Calando's Shares [Member] | Common Stock [Member]
Stock issued during period, value, new issues		1,220
Stock issued during period, shares, new issues		122,000
Issued To Calando Stockholders In Exchange For Calando's Shares [Member] | Additional Paid-In Capital [Member]
Stock issued during period, value, new issues		(160,667)
Issued To Calando Stockholders In Exchange For Calando's Shares [Member] | Retained Earnings [Member]
Stock issued during period, value, new issues
Issued To Calando Stockholders In Exchange For Calando's Shares [Member] | Noncontrolling Interest [Member]
Stock issued during period, value, new issues		159,447
Issued To Calando Stockholders In Exchange For Calando's Shares [Member]
Stock issued during period, value, new issues
Subscription Receivable [Member]
Stock issued during period, value, new issues
Reclassification of former Unidym mezzanine debt to equity
Stock issuance cost charged to additional paid-in capital
Net loss attributable to Arrowhead
Stock issued during period, value, stock options exercised
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition, value
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Issuance of preferred stock in subsidiary		300,000
Amortization of discount on Unidym Series D Preferred Stock
Stockholders' equity, including portion attributable to noncontrolling interest, ending balance	(900,000)		(300,000)							(900,000)
Divestiture of Unidym
Common Stock [Member]
Stock issued during period, value, new issues	87	2,251					12	706
Stock issued during period, shares, new issues	8,656	225,189					1,250	70,553
Reclassification of former Unidym mezzanine debt to equity
Stock issuance cost charged to additional paid-in capital
Net loss attributable to Arrowhead
Stock issued during period, value, stock options exercised	27	7		106	186	116		75
Stock issued during period, shares, stock options exercised	2,700	688		10,536	18,616	11,579		7,500
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition, value
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Issuance of preferred stock in subsidiary
Amortization of discount on Unidym Series D Preferred Stock
Stockholders' equity, including portion attributable to noncontrolling interest, ending balance	86,423	71,735	56,428	42,950	38,622	34,156	27,997	13,645	4,680	86,423
Shares, issued	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	8,642,286
Divestiture of Unidym
Additional Paid-In Capital [Member]
Stock issued during period, value, new issues	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)
Net loss attributable to Arrowhead
Stock issued during period, value, stock options exercised	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	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
Stockholders' equity, including portion attributable to noncontrolling interest, ending balance	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	127,476,435
Divestiture of Unidym
Retained Earnings [Member]
Stock issued during period, value, new issues
Reclassification of former Unidym mezzanine debt to equity
Stock issuance cost charged to additional paid-in capital
Net loss attributable to Arrowhead	(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)
Stock issued during period, value, stock options exercised
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition, value
Adjustments to additional paid in capital, reallocation of noncontrolling interest
Issuance of preferred stock in subsidiary
Amortization of discount on Unidym Series D Preferred Stock			(163,960)
Stockholders' equity, including portion attributable to noncontrolling interest, ending balance	(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)	(113,871,752)
Divestiture of Unidym
Noncontrolling Interest [Member]
Stock issued during period, value, new issues		200
Reclassification of former Unidym mezzanine debt to equity
Stock issuance cost charged to additional paid-in capital
Net loss attributable to Arrowhead	(363,514)	(1,182,990)		(152,609)	(781,829)	(964,752)	121,491	1,777,699
Stock issued during period, value, stock options exercised
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition, value
Adjustments to additional paid in capital, reallocation of noncontrolling interest	849,707	54,655
Issuance of preferred stock in subsidiary
Amortization of discount on Unidym Series D Preferred Stock
Stockholders' equity, including portion attributable to noncontrolling interest, ending balance	(226,938)	(967,406)			152,609	934,438	1,899,190	1,777,699		(226,938)
Divestiture of Unidym	$ 254,275

X

- Definition

Adjustment to Additional Paid in Capital resulting from the recognition of deferred taxes for the temporary difference of the convertible debt with a beneficial conversion feature. A beneficial conversion feature is a nondetachable conversion feature that is in-the-money.

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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Change in additional paid in capital as a result of a reallocation of a subsidiary's stockholders' equity to noncontrolling interest due to the subsidiary issuing stock. This reallocation is from a capital transaction.

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- Definition

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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Direct costs (e.g., legal and accounting fees) associated with issuing stock that is deducted from additional paid in capital. Also includes any direct costs associated with stock issues under a shelf registration.

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Represents an increase in noncontrolling interest from issuance of additional equity interests to noncontrolling interest holders or the sale of a portion of the parent's controlling interest.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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