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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Tax Credit Carryforward [Line Items]      
Amount of income taxes paid $ 0.1us-gaap_IncomeTaxesPaidNet    
Net operating loss carryforwards   29.2us-gaap_OperatingLossCarryforwards  
Net operating losses subject to annual limitation due to change in control   16.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration  
Operating loss carryforwards related to share based compensation   1.2gknt_OperatingLossCarryforwardsShareBasedCompensation  
Research Tax Credit Carryforward      
Tax Credit Carryforward [Line Items]      
Research and development credit carryforward   $ 1.5us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember
$ 1.1us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember