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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Summary of Property and Equipment
The majority of our property and equipment, including rental equipment, is a direct cost to generating revenue and the following table depicts the depreciation associated with each product line at December 31, 2017 , 2016 and 2015 (in thousands):
 
2017
 
2016
 
2015
Rentals
$
20,861

 
$
21,325

 
$
22,308

Sales
265

 
291

 
281

Service & Maintenance
21

 
25

 
16

Total
$
21,147

 
$
21,641

 
$
22,605

Property and equipment consists of the following at December 31, 2017 and 2016 (in thousands):

 
Useful Lives (Years)
 
2017
 
2016
Land
—
 
$
1,290

 
$
169

Building
39
 
6,116

 
6,856

Leasehold improvements
39
 
808

 
794

Office equipment and furniture
5
 
1,490

 
1,454

Software
5
 
573

 
573

Machinery and equipment
7
 
3,133

 
3,111

Vehicles
3
 
5,516

 
6,063

Total

 
18,926

 
19,020

Less accumulated depreciation
 
 
(11,274
)
 
(11,267
)
Total
 
 
$
7,652

 
$
7,753