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v3.19.1

Consolidated Statement of Stockholders' Equity (unaudited) (Parenthetical) | Mar. 31, 2018 $ / shares
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Common stock issued for cash at $5.25 per share |
Stock issued, price per share | $ 5.25

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- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_StatementClassOfStockAxis=arwr_IssuedAtFiveDollarAndTwoFiveCentsPerShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |