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Business Combination (Schedule of Intangible Assets Acquired) (Details) (Treehouse Brand Stores, LLC, USD $)
In Thousands, unless otherwise specified
0 Months Ended
Aug. 01, 2014
Dec. 31, 2014
Business Acquisition [Line Items]    
Gross Asset   $ 1,303us-gaap_FiniteLivedIntangibleAssetsGross
Acquired license agreements    
Business Acquisition [Line Items]    
Gross Asset   1,040us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Estimated Useful Life (Years) 5 years  
Developed technology    
Business Acquisition [Line Items]    
Gross Asset   138us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Estimated Useful Life (Years) 5 years  
Non-competition agreement    
Business Acquisition [Line Items]    
Gross Asset   82us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Estimated Useful Life (Years) 3 years  
Customer lists    
Business Acquisition [Line Items]    
Gross Asset   $ 43us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Estimated Useful Life (Years) 3 years