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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Revenue:
 
 
 
 
 
 
 
Products
$
57,630

 
$
83,835

 
$
116,881

 
$
162,350

Services
1,456

 
1,342

 
2,721

 
2,781

 
$
59,086

 
$
85,177

 
$
119,602

 
$
165,131

Cost of revenue (excluding depreciation and amortization):
 
 
 
 
 
 
 
Products
$
45,511

 
$
57,052

 
$
90,028

 
$
107,741

Services
1,227

 
1,522

 
2,411

 
2,458

 
$
46,738

 
$
58,574

 
$
92,439

 
$
110,199