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Revenue
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
2013
 
2012
 
2013
 
2012
Revenue:
 
 
 
 
 
 
 
Products
$
71,523

 
$
56,425

 
$
127,853

 
$
113,681

Rentals
15,679

 
16,981

 
31,419

 
35,047

Services
6,384

 
4,897

 
12,557

 
8,770

 
$
93,586

 
$
78,303

 
$
171,829

 
$
157,498

Cost of revenue:
 
 
 
 
 
 
 
Products
$
46,992

 
$
34,136

 
$
81,508

 
$
68,620

Rentals
4,281

 
7,497

 
10,798

 
15,507

Services
2,832

 
1,831

 
5,569

 
3,391

Depreciation
1,887

 
1,814

 
3,730

 
3,504

 
$
55,992

 
$
45,278

 
$
101,605

 
$
91,022