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v2.4.1.9

Organization and Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Schedule Of Investments [Line Items] |  |  |  |
Cash to fund operations | $ 103,991,231 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 59,713,424 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 132,510,610 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 19,114,444 us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments | 41,338,901 us-gaap_MarketableSecurities |  | 44,741,378 us-gaap_MarketableSecurities |
Net increase (decrease) in cash | (28,519,379)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 40,598,980 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  |
Cash outflow related to continuing operating activities | (24,200,006)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | (7,022,332)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |  |
Other investing activities | (7,000,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities |  |  |
Capital expenditures | 554,945 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 116,215 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  |
Net cash invested in fixed income investments | 3,100,000 arwr_NetCashInvestedInFixedIncomeInvestments |  |  |
Proceeds from the exercise of warrants and stock options | 283,466 arwr_ProceedsFromExerciseOfWarrantsAndStockOptions |  |  |
Restricted Cash | 0 us-gaap_RestrictedCashAndCashEquivalents |  | 0 us-gaap_RestrictedCashAndCashEquivalents |
Amount insured in FDIC per account | 250,000 us-gaap_CashFDICInsuredAmount |  |  |
Minimum |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |
Maximum |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |  |
Commercial bonds |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Maturity description | less than 24 months |  |  |
Investments | $ 41,300,000 us-gaap_MarketableSecurities / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_BondsMember |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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