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Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Segment Reporting Information [Line Items]    
Number of operating segments | segment 1  
Revenue $ 18,902 $ 21,576
Operating costs and corporate expenses 18,559 17,809
Total other income (expense), net 1 17
Income before provision for income taxes 344 3,784
Corporate    
Segment Reporting Information [Line Items]    
Revenue 0 0
Operating costs and corporate expenses 8,374 8,072
Total other income (expense), net 1 17
Income before provision for income taxes (8,373) (8,055)
Rental    
Segment Reporting Information [Line Items]    
Revenue 11,922 16,408
Operating costs and corporate expenses 4,668 5,694
Total other income (expense), net 0 0
Income before provision for income taxes 7,254 10,714
Sales    
Segment Reporting Information [Line Items]    
Revenue 6,637 4,910
Operating costs and corporate expenses 5,423 3,932
Total other income (expense), net 0 0
Income before provision for income taxes 1,214 978
Service & Maintenance    
Segment Reporting Information [Line Items]    
Revenue 343 258
Operating costs and corporate expenses 94 111
Total other income (expense), net
Income before provision for income taxes $ 249 $ 147