Consolidated Balance Sheets - USD ($)	Jun. 30, 2018	Sep. 30, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 27,995,386	$ 24,838,567
Accounts receivable	14,975	67,797
Prepaid expenses	1,095,977	867,363
Other current assets	279,049	1,359,638
Short term investments	32,484,708	40,769,539
TOTAL CURRENT ASSETS	61,870,095	67,902,904
Long term investments	17,672,658
Property and equipment, net	14,029,239	15,513,019
Intangible assets, net	19,189,117	20,464,439
Other assets	141,918	141,918
TOTAL ASSETS	112,903,027	104,022,280
CURRENT LIABILITIES
Accounts payable	2,165,731	4,076,514
Accrued expenses	2,163,533	4,564,507
Accrued payroll and benefits	1,147,780	3,399,679
Deferred rent	440,580	440,580
Deferred revenue	943,200	5,269,741
Derivative liabilities		695,114
Note Payable	219,889	208,506
Other current liabilities	46,407	46,407
TOTAL CURRENT LIABILITIES	7,127,120	18,701,048
LONG-TERM LIABILITIES
Deferred rent, net of current portion	1,657,899	1,929,052
Note Payable, net of current portion	2,158,649	2,325,018
Other non-current liabilities	200,000	200,000
TOTAL LONG-TERM LIABILITIES	4,016,548	4,454,070
Commitments and contingencies (Note 7)
Arrowhead Pharmaceuticals, Inc. stockholders' equity:
Common stock, $0.001 par value; 145,000,000 shares authorized; 87,854,651 and 74,785,426 shares issued and outstanding as of June 30, 2018 and September 30, 2017, respectively	180,224	167,155
Additional paid-in capital	578,642,206	514,037,301
Accumulated other comprehensive income (loss)	(3,338)	33,232
Accumulated deficit	(476,504,545)	(432,815,338)
Total Arrowhead Pharmaceuticals, Inc. stockholders' equity	102,314,547	81,422,350
Noncontrolling interest	(555,188)	(555,188)
TOTAL STOCKHOLDERS’ EQUITY	101,759,359	80,867,162
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 112,903,027	$ 104,022,280