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Revenue
 9 Months Ended
Sep. 30, 2016
Revenue [Abstract]  
Revenue
Revenue
The Company differentiates revenue and cost of revenue based on whether the source of revenue is attributable to products, rentals, or services. 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