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Segment and Geographic Information (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 16, 2012
Segment
Dec. 31, 2014
Segment
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                        
Number of operating segments                 2us-gaap_NumberOfOperatingSegments 3us-gaap_NumberOfOperatingSegments    
Inventories, net $ 17,752us-gaap_InventoryNet       $ 20,186us-gaap_InventoryNet         $ 17,752us-gaap_InventoryNet $ 20,186us-gaap_InventoryNet  
Net revenue 72,379us-gaap_SalesRevenueGoodsNet 22,240us-gaap_SalesRevenueGoodsNet 23,395us-gaap_SalesRevenueGoodsNet 22,691us-gaap_SalesRevenueGoodsNet 74,338us-gaap_SalesRevenueGoodsNet 22,363us-gaap_SalesRevenueGoodsNet 22,004us-gaap_SalesRevenueGoodsNet 19,557us-gaap_SalesRevenueGoodsNet   140,705us-gaap_SalesRevenueGoodsNet 138,262us-gaap_SalesRevenueGoodsNet 118,913us-gaap_SalesRevenueGoodsNet
International                        
Segment Reporting Information [Line Items]                        
Net revenue                   29,900us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= gknt_InternationalMember
26,800us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= gknt_InternationalMember
23,900us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= gknt_InternationalMember
Wholesale                        
Segment Reporting Information [Line Items]                        
Inventories, net 1,500us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
                1,500us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
   
Net revenue $ 11,812us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 6,910us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 5,562us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 4,812us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 11,654us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 5,373us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 3,750us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 1,576us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
  $ 29,096us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 22,353us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember
$ 6,975us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= gknt_WholesaleMember