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Consolidated Statements of Operations and Comprehensive Income (Loss) (unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
REVENUE	$ 42,696,636	$ 727,375	$ 125,502,807	$ 4,887,321
Type of Revenue [Extensible List]	arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember	arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember	arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember	arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember
OPERATING EXPENSES
Research and development	$ 19,291,710	$ 12,052,653	$ 57,662,381	$ 36,974,625
General and administrative expenses	4,809,177	4,594,441	16,287,841	12,679,822
TOTAL OPERATING EXPENSES	24,100,887	16,647,094	73,950,222	49,654,447
OPERATING INCOME (LOSS)	18,595,749	(15,919,719)	51,552,585	(44,767,126)
OTHER INCOME (EXPENSE)
Interest income (expense), net	1,739,959	313,702	4,717,359	645,778
Change in value of derivatives				432,141
TOTAL OTHER INCOME (EXPENSE)	1,739,959	313,702	4,717,359	1,077,919
INCOME (LOSS) BEFORE INCOME TAXES	20,335,708	(15,606,017)	56,269,944	(43,689,207)
Provision for income taxes	0	0	0	0
NET INCOME (LOSS)	$ 20,335,708	$ (15,606,017)	$ 56,269,944	$ (43,689,207)
NET INCOME (LOSS) PER SHARE - BASIC	$ 0.21	$ (0.18)	$ 0.60	$ (0.53)
NET INCOME (LOSS) PER SHARE - DILUTED	$ 0.21	$ (0.18)	$ 0.58	$ (0.53)
Weighted average shares outstanding - basic	94,935,471	87,634,435	93,364,102	82,149,381
Weighted average shares outstanding - diluted	98,884,744	87,634,435	97,814,019	82,149,381
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Foreign currency translation adjustments	$ (31,172)	$ (28,603)	$ (81,514)	$ (36,570)
COMPREHENSIVE INCOME (LOSS)	$ 20,304,536	$ (15,634,620)	$ 56,188,430	$ (43,725,777)

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration