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Revenue
 3 Months Ended
Mar. 31, 2015
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,
 
 
2015
 
2014
Revenue:
 
 
 
 
Products
 
$
66,160

 
$
82,406

Rentals
 
11,824

 
13,923

Services
 
4,389

 
6,246

 
 
$
82,373

 
$
102,575

Cost of revenue:
 
 
 
 
Products
 
$
45,624

 
$
47,732

Rentals
 
6,285

 
6,513

Services
 
2,042

 
2,715

Depreciation
 
1,895

 
1,934

 
 
$
55,846

 
$
58,894