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Property, Plant and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 6,794us-gaap_PropertyPlantAndEquipmentGross $ 4,903us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation (4,336)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (3,424)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, Plant and equipment, net 2,458us-gaap_PropertyPlantAndEquipmentNet 1,479us-gaap_PropertyPlantAndEquipmentNet  
Depreciation 891us-gaap_Depreciation 639us-gaap_Depreciation 454us-gaap_Depreciation
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 5,338us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
4,028us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
 
Office Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 433us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
389us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
 
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 1,023us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 486us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember