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Revenue (Tables)
 9 Months Ended
Sep. 30, 2016
Revenue [Abstract]  
Differentiation of revenue and cost of revenue
Revenue and cost of revenue by source are as follows (in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2016
 
2015
 
2016
 
2015
Revenue:
 
 
 
 
 
 
 
Products
$
67,176

 
$
76,555

 
$
200,206

 
$
217,237

Rentals
4,168

 
7,574

 
11,366

 
28,146

Services
2,335

 
3,813

 
6,715

 
11,963

 
$
73,679

 
$
87,942

 
$
218,287

 
$
257,346

Cost of revenue:
 
 
 
 
 
 
 
Products
$
44,073

 
$
49,520

 
$
131,464

 
$
145,387

Rentals
1,379

 
3,387

 
3,704

 
13,315

Services
2,018

 
2,160

 
5,730

 
6,283

Depreciation
843

 
1,648

 
3,173

 
5,355

 
$
48,313

 
$
56,715

 
$
144,071

 
$
170,340