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Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Segment Reporting Information [Line Items]        
Number of operating segments | segment     1  
Revenue $ 19,895 $ 18,204 $ 37,886 $ 32,922
Operating costs and corporate expenses 19,302 17,978 37,084 32,346
Total other income (expense), net 177 75 478 (1)
Income before provision for income taxes 770 301 1,280 575
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and corporate expenses 8,365 7,758 16,416 15,166
Total other income (expense), net 177 75 478 (1)
Income before provision for income taxes (8,188) (7,683) (15,938) (15,167)
Rental        
Segment Reporting Information [Line Items]        
Revenue 13,572 11,427 26,959 22,898
Operating costs and corporate expenses 6,359 5,195 12,244 9,899
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 7,213 6,232 14,715 12,999
Sales        
Segment Reporting Information [Line Items]        
Revenue 5,814 6,383 9,939 9,381
Operating costs and corporate expenses 4,419 4,924 8,118 7,115
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 1,395 1,459 1,821 2,266
Service and maintenance        
Segment Reporting Information [Line Items]        
Revenue 509 394 988 643
Operating costs and corporate expenses 159 101 306 166
Total other income (expense), net 0 0 0 0
Income before provision for income taxes $ 350 $ 293 $ 682 $ 477