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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue
Revenue and cost of revenue (excluding depreciation and amortization) disaggregated by revenue source are as follows (in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Revenue:
 
 
 
 
 
 
 
Products
$
69,671

 
$
77,956

 
$
186,552

 
$
240,306

Services
1,318

 
1,502

 
4,039

 
4,283

 
$
70,989

 
$
79,458

 
$
190,591

 
$
244,589

Cost of revenue (excluding depreciation and amortization):
 
 
 
 
 
 
 
Products
$
52,647

 
$
55,846

 
$
142,670

 
$
163,587

Services
1,436

 
1,345

 
3,852

 
3,802

 
$
54,083

 
$
57,191

 
$
146,522

 
$
167,389