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Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Segment Reporting Information [Line Items]        
Number of operating segments | segment     1  
Revenue $ 16,396 $ 15,913 $ 49,318 $ 51,033
Operating costs and corporate expenses 16,440 15,320 48,786 49,683
Total other income (expense), net 180 (14) 179 (12)
Income before provision for income taxes 136 579 711 1,338
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and corporate expenses 7,889 7,660 23,055 23,734
Total other income (expense), net 180 (14) 179 (12)
Income before provision for income taxes (7,709) (7,674) (22,876) (23,746)
Rental        
Segment Reporting Information [Line Items]        
Revenue 12,039 11,292 34,937 34,634
Operating costs and corporate expenses 5,363 4,333 15,262 13,256
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 6,676 6,959 19,675 21,378
Sales        
Segment Reporting Information [Line Items]        
Revenue 3,947 4,256 13,328 15,300
Operating costs and corporate expenses 3,081 3,237 10,196 12,405
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 866 1,019 3,132 2,895
Service & Maintenance        
Segment Reporting Information [Line Items]        
Revenue 410 365 1,053 1,099
Operating costs and corporate expenses 107 90 273 288
Total other income (expense), net 0 0 0 0
Income before provision for income taxes $ 303 $ 275 $ 780 $ 811