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Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Segment Reporting Information [Line Items]        
Number of operating segments | segment 1      
Revenue $ 18,204 $ 16,218 $ 32,922 $ 35,120
Operating costs and corporate expenses 17,978 15,804 32,346 34,363
Total other expense, net 75 1 (1) 2
Income before provision for income taxes 301 415 575 759
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and corporate expenses 7,758 7,700 15,166 16,074
Total other expense, net 75 1 (1) 2
Income before provision for income taxes (7,683) (7,699) (15,167) (16,072)
Rental        
Segment Reporting Information [Line Items]        
Revenue 11,427 11,420 22,898 23,342
Operating costs and corporate expenses 5,195 4,255 9,899 8,923
Total other expense, net 0 0 0 0
Income before provision for income taxes 6,232 7,165 12,999 14,419
Sales        
Segment Reporting Information [Line Items]        
Revenue 6,383 4,407 9,381 11,044
Operating costs and corporate expenses 4,924 3,745 7,115 9,168
Total other expense, net 0 0 0 0
Income before provision for income taxes 1,459 662 2,266 1,876
Service and maintenance        
Segment Reporting Information [Line Items]        
Revenue 394 391 643 734
Operating costs and corporate expenses 101 104 166 198
Total other expense, net 0 0 0 0
Income before provision for income taxes $ 293 $ 287 $ 477 $ 536