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Summary of Significant Accounting Policies (Details Textual) (USD $)
9 Months Ended 12 Months Ended
Sep. 16, 2012
Segment
Dec. 31, 2014
Segment
Dec. 31, 2013
Aug. 01, 2014
Accounting Policies [Line Items]        
Number of operating segments 2us-gaap_NumberOfOperatingSegments 3us-gaap_NumberOfOperatingSegments    
Number of reportable segments   2us-gaap_NumberOfReportableSegments    
Goodwill expected to be deductible for tax purposes   $ 1,100,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount    
Amortization expense   100,000us-gaap_AmortizationOfIntangibleAssets    
Estimated fair value of performance based contingent consideration   865,000us-gaap_BusinessCombinationContingentConsiderationLiability [1] 0us-gaap_BusinessCombinationContingentConsiderationLiability [1]  
Prepaid royalties   800,000us-gaap_PrepaidRoyalties 100,000us-gaap_PrepaidRoyalties  
Accrued royalties   3,973,000us-gaap_AccruedRoyaltiesCurrentAndNoncurrent 3,959,000us-gaap_AccruedRoyaltiesCurrentAndNoncurrent  
Average shipping transit times, minimum   1 day    
Average shipping times, maximum   8 days    
Deferred revenue   3,290,000us-gaap_DeferredRevenueCurrent 2,828,000us-gaap_DeferredRevenueCurrent  
Gift card liability, current   1,600,000us-gaap_AccruedLiabilitiesForUnredeeemedGiftCards 1,200,000us-gaap_AccruedLiabilitiesForUnredeeemedGiftCards  
Deferred revenue relating to payments received in advance of delivery of products   500,000us-gaap_DeferredRevenue    
Right to return products (days)   90 days    
Reward points redemption period   3 years    
Accrued and other liabilities        
Accounting Policies [Line Items]        
Reserves for returns   800,000gknt_SalesReturnsReserve
/ us-gaap_BalanceSheetLocationAxis
= gknt_AccruedandOtherLiabilitiesMember
500,000gknt_SalesReturnsReserve
/ us-gaap_BalanceSheetLocationAxis
= gknt_AccruedandOtherLiabilitiesMember
 
e-Commerce        
Accounting Policies [Line Items]        
Deferred revenue   1,200,000us-gaap_DeferredRevenueCurrent
/ us-gaap_ProductOrServiceAxis
= gknt_ECommerceMember
1,600,000us-gaap_DeferredRevenueCurrent
/ us-gaap_ProductOrServiceAxis
= gknt_ECommerceMember
 
Treehouse Brand Stores, LLC        
Accounting Policies [Line Items]        
Amount of contingent consideration (up to $2.0 million)       2,000,000.0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
Estimated fair value of performance based contingent consideration   1,115,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
  1,259,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
Treehouse Brand Stores, LLC | Fair Value, Measurements, Recurring | Level 3        
Accounting Policies [Line Items]        
Estimated fair value of performance based contingent consideration   1,100,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Treehouse Brand Stores, LLC | Fair Value, Measurements, Recurring | Level 3 | Current liability        
Accounting Policies [Line Items]        
Estimated fair value of performance based contingent consideration   200,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Treehouse Brand Stores, LLC | Fair Value, Measurements, Recurring | Level 3 | Other long term liability        
Accounting Policies [Line Items]        
Estimated fair value of performance based contingent consideration   $ 900,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Minimum        
Accounting Policies [Line Items]        
Intangible asset useful lives   3 years    
Maximum        
Accounting Policies [Line Items]        
Intangible asset useful lives   5 years    
[1] Long-term contingent consideration represents the fair value of the potential earn-out payments related to the acquisition of Treehouse based on the terms of the asset purchase agreement.