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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 4,532 $ 4,948
Less accumulated depreciation (2,481) (2,057)
Property and Equipment, Net 2,051 2,891
Office furniture and equipment
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 1,963 2,073
Office furniture and equipment | Minimum
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Useful Life 3 years  
Office furniture and equipment | Maximum
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Useful Life 7 years  
Rental Inventory
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 1,448 2,142
Property and Equipment, Useful Life 5 years  
Vehicles
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 76 76
Property and Equipment, Useful Life 5 years  
Leasehold improvements
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 874 486
Leasehold improvements | Minimum
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Useful Life 2 years  
Leasehold improvements | Maximum
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Useful Life 6 years  
Assembly equipment
   
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 171 $ 171
Property and Equipment, Useful Life 7 years