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Revenue
 9 Months Ended
Sep. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
Revenue:
 
 
 
 
 
 
 
Products
$
76,376

 
$
56,621

 
$
204,229

 
$
170,302

Rentals
15,375

 
16,374

 
46,794

 
51,420

Services
6,637

 
5,633

 
19,194

 
14,404

 
$
98,388

 
$
78,628

 
$
270,217

 
$
236,126

Cost of revenue:
 
 
 
 
 
 
 
Products
$
50,367

 
$
32,910

 
$
131,875

 
$
101,528

Rentals
6,868

 
7,806

 
17,666

 
23,312

Services
1,610

 
2,271

 
7,179

 
5,665

Depreciation
2,041

 
1,798

 
5,771

 
5,302

 
$
60,886

 
$
44,785

 
$
162,491

 
$
135,807