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Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Segment Reporting Information [Line Items]        
Number of operating segments | segment     1  
Revenue $ 15,913 $ 16,181 $ 51,033 $ 54,951
Operating costs and corporate expenses 15,320 14,358 49,683 47,488
Total other expense, net (14) 8 (12) 16
Income before provision for income taxes 579 1,831 1,338 7,479
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and corporate expenses 7,660 7,532 23,734 23,193
Total other expense, net (14) 8 (12) 16
Income before provision for income taxes (7,674) (7,524) (23,746) (23,177)
Rental        
Segment Reporting Information [Line Items]        
Revenue 11,292 13,157 34,634 44,220
Operating costs and corporate expenses 4,333 4,513 13,256 15,618
Total other expense, net 0 0 0 0
Income before provision for income taxes 6,959 8,644 21,378 28,602
Sales        
Segment Reporting Information [Line Items]        
Revenue 4,256 2,536 15,300 9,746
Operating costs and corporate expenses 3,237 2,191 12,405 8,359
Total other expense, net 0 0 0 0
Income before provision for income taxes 1,019 345 2,895 1,387
Service & Maintenance        
Segment Reporting Information [Line Items]        
Revenue 365 488 1,099 985
Operating costs and corporate expenses 90 122 288 318
Total other expense, net 0 0
Income before provision for income taxes $ 275 $ 366 $ 811 $ 667