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Revenue
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Revenue:
 
 
 
 
 
 
 
Products
$
92,708

 
$
76,376

 
$
257,415

 
$
204,229

Rentals
16,966

 
15,375

 
45,954

 
46,794

Services
7,087

 
6,637

 
21,284

 
19,194

 
$
116,761

 
$
98,388

 
$
324,653

 
$
270,217

Cost of revenue:
 
 
 
 
 
 
 
Products
$
57,315

 
$
50,367

 
$
155,048

 
$
131,875

Rentals
8,272

 
6,868

 
22,444

 
17,666

Services
3,074

 
1,610

 
9,042

 
7,179

Depreciation
2,022

 
2,041

 
6,051

 
5,771

 
$
70,683

 
$
60,886

 
$
192,585

 
$
162,491