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Revenue
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
2014
 
2013
 
2014
 
2013
Revenue:
 
 
 
 
 
 
 
Products
$
82,302

 
$
71,523

 
$
164,707

 
$
127,853

Rentals
15,065

 
15,679

 
28,989

 
31,419

Services
7,951

 
6,384

 
14,197

 
12,557

 
$
105,318

 
$
93,586

 
$
207,893

 
$
171,829

Cost of revenue:
 
 
 
 
 
 
 
Products
$
49,995

 
$
46,992

 
$
97,731

 
$
81,508

Rentals
7,654

 
4,281

 
14,165

 
10,798

Services
3,265

 
2,832

 
5,978

 
5,569

Depreciation
2,094

 
1,887

 
4,029

 
3,730

 
$
63,008

 
$
55,992

 
$
121,903

 
$
101,605