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Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
Segment Reporting Information [Line Items]        
Number of operating segments | segment     1  
Revenue $ 16,218 $ 17,194 $ 35,120 $ 38,770
Operating costs and corporate expenses 15,804 15,321 34,363 33,130
Total other income (expense), net 1 (9) 2 8
Income before provision for income taxes 415 1,864 759 5,648
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and corporate expenses 7,700 7,589 16,074 15,661
Total other income (expense), net 1 (9) 2 8
Income before provision for income taxes (7,699) (7,598) (16,072) (15,653)
Rental        
Segment Reporting Information [Line Items]        
Revenue 11,420 14,655 23,342 31,063
Operating costs and corporate expenses 4,255 5,411 8,923 11,105
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 7,165 9,244 14,419 19,958
Sales        
Segment Reporting Information [Line Items]        
Revenue 4,407 2,300 11,044 7,210
Operating costs and corporate expenses 3,745 2,236 9,168 6,168
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 662 64 1,876 1,042
Service & Maintenance        
Segment Reporting Information [Line Items]        
Revenue 391 239 734 497
Operating costs and corporate expenses 104 85 198 196
Total other income (expense), net 0 0
Income before provision for income taxes $ 287 $ 154 $ 536 $ 301