Consolidated Statements of Operations (unaudited) - USD ($)	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
REVENUE	$ 43,750	$ 170,750
OPERATING EXPENSES
Research and development	10,338,833	17,744,312
Salaries and payroll-related costs	3,919,886	3,150,617
General and administrative expenses	1,951,609	2,086,202
Stock-based compensation	2,380,343	2,014,856
Depreciation and amortization	794,349	290,039
TOTAL OPERATING EXPENSES	19,385,020	25,286,026
OPERATING LOSS	(19,341,270)	(25,115,276)
OTHER INCOME (EXPENSE)
Gain (loss) on sale of fixed assets, net		(26,381)
Interest income (expense), net	100,380	237,417
Change in value of derivatives	(23,524)	2,382,142
Other income (expense)		(53,184)
TOTAL OTHER INCOME (EXPENSE)	76,856	2,539,994
LOSS BEFORE INCOME TAXES	(19,264,414)	(22,575,282)
NET LOSS	(19,264,414)	(22,575,282)
NET LOSS ATTRIBUTABLE TO ARROWHEAD	$ (19,264,414)	$ (22,575,282)
NET LOSS PER SHARE ATTRIBUTABLE TO ARROWHEAD SHAREHOLDERS - BASIC AND DILUTED:	$ (0.32)	$ (0.41)
Weighted average shares outstanding - basic and diluted	59,548,672	54,692,392
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
Foreign Currency Translation Adjustments	$ 45,818
COMPREHENSIVE LOSS ATTRIBUTABLE TO ARROWHEAD	$ (19,218,596)	$ (22,575,282)