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Revenue (Tables)
 9 Months Ended
Sep. 30, 2015
Revenue [Abstract]  
Differentiation of revenue and cost of revenue
Revenue and cost of revenue by source are as follows (in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
Revenue:
 
 
 
 
 
 
 
Products
$
76,555

 
$
92,708

 
$
217,237

 
$
257,415

Rentals
7,574

 
16,966

 
28,146

 
45,954

Services
3,813

 
7,087

 
11,963

 
21,284

 
$
87,942

 
$
116,761

 
$
257,346

 
$
324,653

Cost of revenue:
 
 
 
 
 
 
 
Products
$
49,520

 
$
57,315

 
$
145,387

 
$
155,048

Rentals
3,387

 
8,272

 
13,315

 
22,444

Services
2,160

 
3,074

 
6,283

 
9,042

Depreciation
1,648

 
2,022

 
5,355

 
6,051

 
$
56,715

 
$
70,683

 
$
170,340

 
$
192,585