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Commitments and Contingencies (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies [Abstract]    
Equipment under capital lease $ 458us-gaap_CapitalLeasedAssetsGross   
Less: accumulated depreciation 350us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 214us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net book value $ 654us-gaap_PropertyPlantAndEquipmentNet $ 335us-gaap_PropertyPlantAndEquipmentNet