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Revenue
 6 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Revenue:
 
 
 
 
 
 
 
Products
$
74,522

 
$
82,302

 
$
140,682

 
$
164,707

Rentals
8,747

 
15,065

 
20,571

 
28,989

Services
3,761

 
7,951

 
8,151

 
14,197

 
$
87,030

 
$
105,318

 
$
169,404

 
$
207,893

Cost of revenue:
 
 
 
 
 
 
 
Products
$
50,189

 
$
49,995

 
$
95,850

 
$
97,731

Rentals
3,687

 
7,654

 
9,943

 
14,165

Services
2,089

 
3,265

 
4,124

 
5,978

Depreciation
1,813

 
2,094

 
3,708

 
4,029

 
$
57,778

 
$
63,008

 
$
113,625

 
$
121,903