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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property and Equipment      
Property and equipment, gross $ 1,857 $ 202  
Accumulated depreciation (302) (175)  
Property and equipment, net 1,555 27  
Depreciation expense $ 127 20 $ 31
Minimum      
Property and Equipment      
Useful Life 3 years    
Maximum      
Property and Equipment      
Useful Life 10 years    
Manufacturing equipment      
Property and Equipment      
Property and equipment, gross $ 617    
Manufacturing equipment | Minimum      
Property and Equipment      
Useful Life 7 years    
Manufacturing equipment | Maximum      
Property and Equipment      
Useful Life 10 years    
Computer and other office equipment      
Property and Equipment      
Useful Life 5 years    
Property and equipment, gross $ 292 85  
Furniture and fixtures      
Property and Equipment      
Useful Life 7 years    
Property and equipment, gross $ 591 $ 117  
Leasehold improvements      
Property and Equipment      
Property and equipment, gross $ 357    
Leasehold improvements | Minimum      
Property and Equipment      
Useful Life 3 years    
Leasehold improvements | Maximum      
Property and Equipment      
Useful Life 5 years