Consolidated Statements of Cash Flows (USD $)	3 Months Ended		128 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES OF CONTINUING OPERATIONS:
Net loss	$ (10,685,732)	$ (4,780,727)	$ (196,042,170)
Net loss attributable to noncontrolling interests	57,420	166,568	19,436,849
NET LOSS ATTRIBUTABLE TO ARROWHEAD	(10,628,312)	(4,614,159)	(176,605,321)
(Income) loss from discontinued operations		18	42,838,408
Realized and unrealized (gain) loss on investments			(762,954)
Charge for bad debt allowance			2,497,300
(Gain) loss from sale of subsidiary			(306,344)
(Gain) loss on purchase of Roche Madison			(1,576,107)
(Gain) loss on disposal of fixed assets	53,562	(18,493)	1,336,415
Stock issued for professional services			741,632
Change in value of derivatives	3,519,579	(44,275)	5,538,564
Contingent consideration - fair value adjustments			1,421,652
Purchased in-process research and development			15,851,555
Stock-based compensation	521,138	395,675	15,638,877
Depreciation and amortization	403,405	449,597	9,564,103
Amortization (accretion) of note discounts, net	28,443	572	158,301
Gain on sale of stock in subsidiary			(2,292,800)
Noncash impairment expense			3,958,496
Equity in income (loss) of unconsolidated affiliates		63,557	963,407
Noncontrolling interest	(57,420)	(166,568)	(19,436,849)
Changes in operating assets and liabilities:
Receivables		(105,891)	34,415
Other receivables	(11,825)		(2,553,887)
Prepaid expenses	(74,455)	157,208	(510,841)
Other current assets		(12,441)	(165,566)
Accounts payable	(610,284)	(68,459)	209,673
Accrued expenses	56,648	111,865	805,477
Other liabilities	(222,811)	14,208	719,440
NET CASH USED IN OPERATING ACTIVITIES OF CONTINUING OPERATIONS	(7,022,332)	(3,837,586)	(101,932,954)
CASH FLOWS FROM INVESTING ACTIVITIES OF CONTINUING OPERATIONS:
Purchases of property and equipment	(116,215)	(9,439)	(4,458,404)
Proceeds from sale of investments			4,732,688
Proceeds from sale of fixed assets		121,418	522,192
Purchase of marketable securities	(19,075,306)		(48,383,752)
Proceeds from sale of marketable securities	4,045,956		22,934,181
Cash transferred in acquisitions/divestitures			(1,579,365)
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 subsidiaries			359,375
Payment for patents			(303,440)
Restricted cash			50,773
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES OF CONTINUING OPERATIONS	(15,145,565)	111,979	(27,996,158)
CASH FLOWS FROM FINANCING ACTIVITIES OF CONTINUING OPERATIONS:
Principal payments on capital leases	(54,715)	(53,098)	(466,122)
Proceeds from issuance of common stock, preferred stock and warrants, net	62,821,592	3,332,467	213,580,607
Proceeds from issuance of Calando debt			2,516,467
Proceeds from sale of stock in subsidiary			20,902,100
NET CASH PROVIDED BY FINANCING ACTIVITIES OF CONTINUING OPERATIONS	62,766,877	3,279,369	236,533,052
Cash flows from discontinued operations:
Operating cash flows		(18)	(46,004,141)
Investing cash flows			790,625
Financing cash flows			(1,677,000)
Net cash provided by (used in) discontinued operations:		(18)	(46,890,516)
NET INCREASE (DECREASE) IN CASH	40,598,980	(446,256)	59,713,424
CASH AT BEGINNING OF PERIOD	19,114,444	3,377,288
CASH AT END OF PERIOD	59,713,424	2,931,032	59,713,424
Supplementary disclosures:
Interest paid	9,496	11,114	332,228
Taxes paid			$ 742,500