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Summary of Significant Accounting Policies Schedule of Changes in Carrying Amount of Intangible Assets (Details) (Treehouse Brand Stores, LLC, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]  
Gross Asset $ 1,303us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (115)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Asset 1,188us-gaap_FiniteLivedIntangibleAssetsNet
Acquired license agreements
 
Finite-Lived Intangible Assets [Line Items]  
Gross Asset 1,040us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Accumulated Amortization (87)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Net Asset 953us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Developed technology
 
Finite-Lived Intangible Assets [Line Items]  
Gross Asset 138us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Accumulated Amortization (11)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Net Asset 127us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Non-competition agreement
 
Finite-Lived Intangible Assets [Line Items]  
Gross Asset 82us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Accumulated Amortization (11)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Net Asset 71us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Customer lists
 
Finite-Lived Intangible Assets [Line Items]  
Gross Asset 43us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Accumulated Amortization (6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Net Asset $ 37us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember