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BUSINESS COMBINATIONS (Details) (USD $)
0 Months Ended 12 Months Ended
Jul. 18, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Purchase Allocation        
Goodwill   $ 9,945,000us-gaap_Goodwill $ 9,945,000us-gaap_Goodwill $ 9,031,000us-gaap_Goodwill
YFind        
Business Acquisition [Line Items]        
Purchase consideration paid in cash 6,138,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
Options granted (in shares) 51,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
Payment period for retention bonuses 2 years      
Compensation costs related to acquisition   1,100,000rkus_DeferredAndShareBasedCompensationExpense
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
1,000,000rkus_DeferredAndShareBasedCompensationExpense
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
 
Purchase Allocation        
Cash and cash equivalents 257,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
Other tangible assets 8,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
In-process research and development 6,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
Goodwill 914,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
Noncurrent deferred tax liabilities (1,020,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
Other liabilities assumed (21,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
Total purchase consideration $ 6,138,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
     
YFind | Minimum        
Business Acquisition [Line Items]        
Vesting period for equity awards 3 years      
YFind | Maximum        
Business Acquisition [Line Items]        
Vesting period for equity awards 4 years      
YFind | RSU        
Business Acquisition [Line Items]        
Awards granted (in shares) 219,782us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember