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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
segment
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Number of operating segments     1  
Revenue $ 21,865 $ 19,290 $ 66,106 $ 70,174
Operating costs and expenses 16,777 15,048 49,036 55,482
Other income (expense) 122 (45) 348 49
Income before provision for income taxes 5,210 4,197 17,418 14,741
Sales
        
Segment Reporting Information [Line Items]        
Revenue 3,893 4,935 15,057 28,015
Operating costs and expenses 2,454 3,126 8,935 20,244
Other income (expense) 0 0 0 0
Income before provision for income taxes 1,439 1,809 6,122 7,771
Rental
        
Segment Reporting Information [Line Items]        
Revenue 17,805 14,120 50,533 41,529
Operating costs and expenses 7,449 5,896 20,519 17,279
Other income (expense) 0 0 0 0
Income before provision for income taxes 10,356 8,224 30,014 24,250
Service & Maintenance
        
Segment Reporting Information [Line Items]        
Revenue 167 235 516 630
Operating costs and expenses 80 88 233 279
Other income (expense) 0 0 0 0
Income before provision for income taxes 87 147 283 351
Corporate
        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 6,794 5,938 19,349 17,680
Other income (expense) 122 (45) 348 49
Income before provision for income taxes $ (6,672) $ (5,983) $ (19,001) $ (17,631)