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Rhapsody Joint Venture (Additional Information) (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2010
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Mar. 30, 2010
Schedule of Equity Method Investments [Line Items]            
Cash payments   $ 5,299,000us-gaap_PaymentsForRestructuring $ 5,636,000us-gaap_PaymentsForRestructuring $ 9,629,000us-gaap_PaymentsForRestructuring    
Losses recorded in the operations of Rhapsody   4,452,000us-gaap_IncomeLossFromEquityMethodInvestments 6,268,000us-gaap_IncomeLossFromEquityMethodInvestments 5,709,000us-gaap_IncomeLossFromEquityMethodInvestments    
Carrying value of Rhapsody investment   10,000,000us-gaap_EquityMethodInvestments 12,473,000us-gaap_EquityMethodInvestments      
Rhapsody America LLC            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (percent) 47.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
43.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
    45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
51.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
Cash payments 18,000,000us-gaap_PaymentsForRestructuring
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
         
Liquidation preference   10,000,000rnwk_EquityMethodInvestmentPreferredStockLiquidationPreferenceValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
       
Losses recorded in the operations of Rhapsody   4,500,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
6,300,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
5,700,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
   
Carrying value of Rhapsody investment   $ 10,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
$ 12,500,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
     
Rhapsody America LLC | MTV Networks            
Schedule of Equity Method Investments [Line Items]            
Noncontrolling ownership interest (percent) 49.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnwk_MtvNetworksJointOwnerMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember