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Consolidated Statement of Stockholders' Equity (unaudited) (Parenthetical) (USD $) | Sep. 30, 2014
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Common stock issued @ $5.86 |
Common stock issued, price per share | $ 5.86 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember
Common stock issued @ $18.95 |
Common stock issued, price per share | $ 18.95 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember
Preferred stock issued at $1,000 per share |
Common stock issued, price per share | $ 1,000 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = arwr_PreferredStockIssuedAtThousandDollarPerShareMember

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