XML 63 R35.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Acquisitions - Summary of Purchase Consideration (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Mar. 03, 2015 | Sep. 30, 2015
Asset Acquisition [Line Items] |  |
Cash Paid |  | $ 10,000,000
Novartis |  |
Asset Acquisition [Line Items] |  |
Cash Paid | $ 10,000,000 | 10,000,000
Value of Shares Issued | 25,000,000 | $ 25,000,000
Total purchase consideration | $ 35,000,000 |

X
- Definition Asset acquisition consideration transferred. + References No definition available. + Details
Name: | arwr_AssetAcquisitionConsiderationTransferred
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Asset acquisition. + References No definition available. + Details
Name: | arwr_AssetAcquisitionLineItems
Namespace Prefix: | arwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities. + References No definition available. + Details
Name: | us-gaap_PaymentsToAcquireAssetsInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Value of stock issued pursuant to acquisitions during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueAcquisitions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | arwr_AssetAcquisitionAxis=arwr_NovartisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |