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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Net revenue:    
Rental $ 9,892 $ 8,533
Sales 24,256 15,552
Total net revenue 34,148 24,085
Cost of revenue:    
Rental 1,842 802
Sales 5,529 4,400
Total cost of revenue 7,371 5,202
Gross profit 26,777 18,883
Selling, general and administrative expense 23,676 17,322
Income from operations 3,101 1,561
Other income (expense):    
Interest income 1 5
Interest expense and loss on extinguishment of debt (460) (215)
Other income (expense) 2 (16)
Total other income (expense) (457) (226)
Income before income taxes 2,644 1,335
Income tax expense 1,080 985
Net income $ 1,564 $ 350
Net income per share:    
Basic $ 0.05 $ 0.01
Diluted $ 0.05 $ 0.01
Weighted average number of common shares outstanding:    
Basic 30,750,108 30,546,070
Diluted 30,978,288 30,704,737