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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Property and Equipment    
Property and Equipment Gross $ 5,064 $ 4,615
Less accumulated depreciation (1,380) (1,193)
Property and Equipment Net 3,684 3,422
Office furniture and equipment [Member]
   
Property and Equipment    
Property and Equipment Gross 1,631 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 2,849 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 $ 133 $ 89