Unaudited Quarterly Financial Data - Summary of Unaudited Quarterly Financial Data (Detail) - USD ($) |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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Quarterly Financial Information Disclosure [Abstract] | |||||||||||
Revenues | $ 43,292,770 | $ 42,696,636 | $ 48,148,275 | $ 34,657,896 | $ 11,255,000 | $ 727,375 | $ 650,125 | $ 3,509,821 | $ 168,795,577 | $ 16,142,321 | $ 31,407,709 |
Type of Revenue [Extensible List] | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember | arwr:TechnologyLicensesCollaborativeResearchAndDevelopmentArrangementsResearchGrantsAndProductSalesMember |
Operating Income (Loss) | $ 9,638,049 | $ 18,595,749 | $ 22,010,692 | $ 10,946,144 | $ (11,169,109) | $ (15,919,719) | $ (15,034,059) | $ (13,813,348) | $ 61,190,634 | $ (55,936,235) | $ (36,995,909) |
Net Income (Loss) | $ 11,704,906 | $ 20,335,708 | $ 23,896,982 | $ 12,037,253 | $ (10,761,272) | $ (15,606,017) | $ (14,884,311) | $ (13,198,878) | $ 67,974,849 | $ (54,450,478) | $ (34,380,295) |
Net Income (Loss) per share - BASIC | $ 0.12 | $ 0.21 | $ 0.25 | $ 0.13 | $ (0.12) | $ (0.18) | $ (0.18) | $ (0.18) | $ 0.72 | $ (0.65) | $ (0.47) |
Net Income (Loss) per share - DILUTED | $ 0.12 | $ 0.21 | $ 0.24 | $ 0.13 | $ (0.12) | $ (0.18) | $ (0.18) | $ (0.18) | $ 0.69 | $ (0.65) | $ (0.47) |