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Revenue
 3 Months Ended
Mar. 31, 2016
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 March 31,
 
2016
 
2015
Revenue:
 
 
 
Products
$
65,874

 
$
66,160

Rentals
4,052

 
11,824

Services
2,363

 
4,389

 
$
72,289

 
$
82,373

Cost of revenue:
 
 
 
Products
$
42,474

 
$
45,624

Rentals
1,299

 
6,285

Services
2,096

 
2,042

Depreciation
1,491

 
1,895

 
$
47,360

 
$
55,846