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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Property and Equipment    
Property and Equipment, Gross $ 5,602 $ 4,615
Less accumulated depreciation (1,751) (1,193)
Property and Equipment, Net 3,851 3,422
Office furniture and equipment [Member]
   
Property and Equipment    
Property and Equipment, Gross 1,836 1,425
Office furniture and equipment [Member] | Maximum [Member]
   
Property and Equipment    
Property and Equipment, Useful Life 7 years  
Office furniture and equipment [Member] | Minimum [Member]
   
Property and Equipment    
Property and Equipment, Useful Life 3 years  
Rental inventory [Member]
   
Property and Equipment    
Property and Equipment, Useful Life 5 years  
Property and Equipment, Gross 3,147 2,657
Vehicles [Member]
   
Property and Equipment    
Property and Equipment, Useful Life 5 years  
Property and Equipment, Gross 76 76
Leasehold improvements [Member]
   
Property and Equipment    
Property and Equipment, Gross 375 368
Leasehold improvements [Member] | Maximum [Member]
   
Property and Equipment    
Property and Equipment, Useful Life 6 years  
Leasehold improvements [Member] | Minimum [Member]
   
Property and Equipment    
Property and Equipment, Useful Life 2 years  
Assembly equipment [Member]
   
Property and Equipment    
Property and Equipment, Useful Life 7 years  
Property and Equipment, Gross $ 168 $ 89