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Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |
REVENUE | $ 168,795,577 | $ 16,142,321 | $ 31,407,709
Type of Revenue [Extensible List] | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember
OPERATING EXPENSES |  |  |
Research and development | $ 81,048,686 | $ 52,968,505 | $ 50,904,466
General and administrative expenses | 26,556,257 | 19,110,051 | 17,499,152
TOTAL OPERATING EXPENSES | 107,604,943 | 72,078,556 | 68,403,618
OPERATING INCOME (LOSS) | 61,190,634 | (55,936,235) | (36,995,909)
OTHER INCOME (EXPENSE) |  |  |
Interest income (expense), net | 6,957,768 | 1,048,523 | 415,128
Change in value of derivatives |  | 432,141 | 890,362
Other income (expense) |  | 7,493 | 1,312,524
TOTAL OTHER INCOME (EXPENSE) | 6,957,768 | 1,488,157 | 2,618,014
INCOME (LOSS) BEFORE INCOME TAXES | 68,148,402 | (54,448,078) | (34,377,895)
Provision for income taxes | (173,553) | (2,400) | (2,400)
NET INCOME (LOSS) | $ 67,974,849 | $ (54,450,478) | $ (34,380,295)
NET INCOME (LOSS) PER SHARE - BASIC | $ 0.72 | $ (0.65) | $ (0.47)
NET INCOME (LOSS) PER SHARE - DILUTED | $ 0.69 | $ (0.65) | $ (0.47)
Weighted average shares outstanding - basic | 93,858,857 | 83,638,469 | 73,898,598
Weighted average shares outstanding - diluted | 98,607,815 | 83,638,469 | 73,898,598
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX: |  |  |
Foreign Currency Translation Adjustments | $ (370,060) | $ (54,796) | $ 25,783
COMPREHENSIVE INCOME (LOSS) | $ 67,604,789 | $ (54,505,274) | $ (34,354,512)

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