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Consolidated Statements of Operations and Comprehensive Income (Loss) (unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]        
REVENUE $ 23,528,853 $ 48,148,275 $ 52,983,433 $ 82,806,171
Type of Revenue [Extensible List] arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember
OPERATING EXPENSES        
Research and development $ 29,443,335 $ 20,798,628 $ 52,816,951 $ 38,370,671
General and administrative expenses 16,325,773 5,338,955 27,260,330 11,478,664
TOTAL OPERATING EXPENSES 45,769,108 26,137,583 80,077,281 49,849,335
OPERATING INCOME (LOSS) (22,240,255) 22,010,692 (27,093,848) 32,956,836
OTHER INCOME (EXPENSE)        
Interest income (expense), net 2,404,685 1,886,290 4,584,550 2,977,399
TOTAL OTHER INCOME (EXPENSE) 2,404,685 1,886,290 4,584,550 2,977,399
INCOME (LOSS) BEFORE INCOME TAXES (19,835,570) 23,896,982 (22,509,298) 35,934,235
NET INCOME (LOSS) $ (19,835,570) $ 23,896,982 $ (22,509,298) $ 35,934,235
NET INCOME (LOSS) PER SHARE - BASIC $ (0.20) $ 0.25 $ (0.23) $ 0.39
NET INCOME (LOSS) PER SHARE - DILUTED $ (0.20) $ 0.24 $ (0.23) $ 0.37
Weighted average shares outstanding - basic 101,653,136 94,155,407 99,359,140 92,623,615
Weighted average shares outstanding - diluted 101,653,136 98,082,644 99,359,140 97,214,546
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:        
Foreign currency translation adjustments $ (433,564) $ (28,162) $ (237,490) $ (50,342)
COMPREHENSIVE INCOME (LOSS) $ (20,269,134) $ 23,868,820 $ (22,746,788) $ 35,883,893