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Revenue
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
2016
 
2015
 
2016
 
2015
Revenue:
 
 
 
 
 
 
 
Products
$
67,155

 
$
74,522

 
$
133,030

 
$
140,682

Rentals
3,146

 
8,747

 
7,198

 
20,571

Services
2,018

 
3,761

 
4,380

 
8,151

 
$
72,319

 
$
87,030

 
$
144,608

 
$
169,404

Cost of revenue:
 
 
 
 
 
 
 
Products
$
44,919

 
$
50,189

 
$
87,391

 
$
95,850

Rentals
1,026

 
3,687

 
2,326

 
9,943

Services
1,615

 
2,089

 
3,712

 
4,124

Depreciation
838

 
1,813

 
2,330

 
3,708

 
$
48,398

 
$
57,778

 
$
95,759

 
$
113,625