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Revenue
 9 Months Ended
Sep. 30, 2017
Revenue [Abstract]  
Revenue
Revenue
The Company differentiates revenue and cost of revenue based on whether the source of revenue is attributable to products or services. Revenue and cost of revenue by source are as follows (in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
Revenue:
 
 
 
 
 
 
 
Products
$
77,956

 
$
62,562

 
$
240,306

 
$
187,122

Services
1,502

 
1,775

 
4,283

 
5,105

 
$
79,458

 
$
64,337

 
$
244,589

 
$
192,227

Cost of revenue:
 
 
 
 
 
 
 
Products
$
55,846

 
$
41,117

 
$
163,587

 
$
122,055

Services
1,345

 
354

 
3,802

 
950

Depreciation
527

 
512

 
1,627

 
1,357

 
$
57,718

 
$
41,983

 
$
169,016

 
$
124,362