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