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Shareholders’ Equity (Narrative) (Details) (Preferred stock, Series A)
Dec. 31, 2014
vote
Sep. 30, 2014
Oct. 16, 1988
Preferred stock, Series A
      
Class of Stock [Line Items]      
Number of votes available 1,000rnwk_PreferredStockVotingRightsNumberOfVotesAvailable
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		    
Dividends declared   0.001rnwk_DividendsDeclaredRightToPurchasePreferredstockAsFactorOfTotalOutstandingCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 0.001rnwk_DividendsDeclaredRightToPurchasePreferredstockAsFactorOfTotalOutstandingCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember