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Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Segment Reporting Information [Line Items]    
Number of operating segments | segment 1  
Revenue $ 14,718 $ 18,902
Operating costs and corporate expenses 14,368 18,559
Total other expense, net (76) 1
Income before provision for income taxes 274 344
Corporate    
Segment Reporting Information [Line Items]    
Revenue 0 0
Operating costs and corporate expenses 7,408 8,374
Total other expense, net (76) 1
Income before provision for income taxes (7,484) (8,373)
Rental    
Segment Reporting Information [Line Items]    
Revenue 11,471 11,922
Operating costs and corporate expenses 4,704 4,668
Total other expense, net 0 0
Income before provision for income taxes 6,767 7,254
Sales    
Segment Reporting Information [Line Items]    
Revenue 2,998 6,637
Operating costs and corporate expenses 2,191 5,423
Total other expense, net 0 0
Income before provision for income taxes 807 1,214
Service & Maintenance    
Segment Reporting Information [Line Items]    
Revenue 249 343
Operating costs and corporate expenses 65 94
Total other expense, net 0 0
Income before provision for income taxes $ 184 $ 249