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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue Revenue and operating expenses (excluding depreciation and amortization) disaggregated by revenue source are as follows (in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2019
 
2018
 
2019
 
2018
Revenue:
 
 
 
 
 
 
 
Products
$
21,031

 
$
52,510

 
$
96,733

 
$
130,652

Services
848

 
1,199

 
3,094

 
3,672

 
$
21,879

 
$
53,709

 
$
99,827

 
$
134,324

Operating expenses (excluding depreciation and amortization):
 
 
 
 
 
 
Products
$
23,637

 
$
44,048

 
$
105,440

 
$
114,365

Services
52

 
1,599

 
1,153

 
3,483

 
$
23,689

 
$
45,647

 
$
106,593

 
$
117,848