XML 16 R33.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Investment in Subsidiaries - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2011 | Sep. 30, 2010
Schedule Of Investments [Line Items] |  |  |
Ownership percentage in subsidiary | 100.00% |  |
Issuance of preferred stock in subsidiary |  | $ 1,618,509 | $ 300,000
Calando Pharmaceuticals Inc |  |  |
Schedule Of Investments [Line Items] |  |  |
Outstanding Balance of Promissory Note | 1,167,000 |  |
Amount owed by subsidiary | 4,500,000 |  |
Stated percentage of notes and advances | 8.00% |  |
Percentage of outstanding shares | 79.00% |  |
Percentage of investment ownership | 76.00% |  |
Ablaris Therapeutics |  |  |
Schedule Of Investments [Line Items] |  |  |
Percentage of outstanding shares | 64.00% |  |
Percentage of investment ownership | 64.00% |  |
Issuance of preferred stock in subsidiary |  | 2,900,000 |
Investment in preferred stock |  | 1,300,000 |
Investment in preferred stock by outsider |  | $ 1,600,000 |

X
- Definition Amount owed by subsidiary. + References No definition available. + Details
Name: | arwr_AmountOwedBySubsidiary
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Equity method investment ownership percentage on dilutive basis. + References No definition available. + Details
Name: | arwr_EquityMethodInvestmentOwnershipPercentageOnDilutiveBasis
Namespace Prefix: | arwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Investment in preferred stock. + References No definition available. + Details
Name: | arwr_InvestmentInPreferredStock
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment in preferred stock by outsider. + References No definition available. + Details
Name: | arwr_InvestmentInPreferredStockByOutsider
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Outstanding Balance of Promissory Note + References No definition available. + Details
Name: | arwr_OutstandingBalanceOfPromissoryNote
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ownership percentage in subsidiary. + References No definition available. + Details
Name: | arwr_OwnershipPercentageInSubsidiary
Namespace Prefix: | arwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stated percentage of notes and advances. + References No definition available. + Details
Name: | arwr_StatedPercentageOfNotesAndAdvances
Namespace Prefix: | arwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration