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Business Combination (Schedule of Pro Forma Information) (Details) (Treehouse Brand Stores, LLC, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Treehouse Brand Stores, LLC
   
Business Acquisition [Line Items]    
Net revenue $ 145,524us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
$ 147,465us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
Net loss $ (9,173)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
$ (481)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
Basic and diluted earnings per share $ (1.37)gknt_BusinessAcquisitionProFormaEarningsPerShareBasicandDiluted
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember
$ (0.07)gknt_BusinessAcquisitionProFormaEarningsPerShareBasicandDiluted
/ us-gaap_BusinessAcquisitionAxis
= gknt_TreehouseBrandStoresLLCMember