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Revenue
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
2017
 
2016
 
2017
 
2016
Revenue:
 
 
 
 
 
 
 
Products
$
83,835

 
$
62,561

 
$
162,350

 
$
124,560

Services
1,342

 
1,518

 
2,781

 
3,330

 
$
85,177

 
$
64,079

 
$
165,131

 
$
127,890

Cost of revenue:
 
 
 
 
 
 
 
Products
$
57,052

 
$
41,692

 
$
107,741

 
$
80,936

Services
1,522

 
172

 
2,458

 
598

Depreciation
512

 
497

 
1,099

 
845

 
$
59,086

 
$
42,361

 
$
111,298

 
$
82,379