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Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Segment Reporting Information [Line Items]    
Number of operating segments | segment 1  
Revenue $ 17,991 $ 14,718
Operating costs and corporate expenses 17,782 14,368
Total other income (expense), net 301 (76)
Income before provision for income taxes 510 274
Corporate    
Segment Reporting Information [Line Items]    
Revenue 0 0
Operating costs and corporate expenses 8,051 7,408
Total other income (expense), net 301 (76)
Income before provision for income taxes (7,750) (7,484)
Rental    
Segment Reporting Information [Line Items]    
Revenue 13,387 11,471
Operating costs and corporate expenses 5,885 4,704
Total other income (expense), net 0 0
Income before provision for income taxes 7,502 6,767
Sales    
Segment Reporting Information [Line Items]    
Revenue 4,125 2,998
Operating costs and corporate expenses 3,699 2,191
Total other income (expense), net 0 0
Income before provision for income taxes 426 807
Service and maintenance    
Segment Reporting Information [Line Items]    
Revenue 479 249
Operating costs and corporate expenses 147 65
Total other income (expense), net 0 0
Income before provision for income taxes $ 332 $ 184