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Revenue (Tables)
 3 Months Ended
Mar. 31, 2016
Revenue [Abstract]  
Differentiation of revenue and cost of revenue
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