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Consolidated Statement of Stockholders' Equity (unaudited) (Parenthetical)	Jun. 30, 2018 $ / shares
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: