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Revenue (Tables)
 9 Months Ended
Sep. 30, 2017
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,
 
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