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Summary of Significant Accounting Policies Schedule of Changes in Contingent Consideration (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 5 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Business Acquisition [Line Items]        
Balance, at acquisition $ 0us-gaap_BusinessCombinationContingentConsiderationLiability [1]      
Change in fair value, including accretion 106us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1  
Balance, end of period 865us-gaap_BusinessCombinationContingentConsiderationLiability [1] 0us-gaap_BusinessCombinationContingentConsiderationLiability [1]   865us-gaap_BusinessCombinationContingentConsiderationLiability [1]
Treehouse Brand Stores, LLC        
Business Acquisition [Line Items]        
Balance, at acquisition       1,259us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
Contingent consideration paid during the period       (250)us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
Change in fair value, including accretion       106us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
Balance, end of period $ 1,115us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
    $ 1,115us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
[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.