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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2020
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,
 
2020
 
2019
 
2020
 
2019
Revenue:
 
 
 
 
 
 
 
Products
$
12,076

 
$
21,031

 
$
39,053

 
$
96,733

Services
663

 
848

 
1,982

 
3,094

 
$
12,739

 
$
21,879

 
$
41,035

 
$
99,827

Operating expenses (excluding depreciation and amortization):
 
 
 
 
 
 
Products
$
29,041

 
$
23,542

 
$
62,866

 
$
105,078

Services
425

 
80

 
1,073

 
633

 
$
29,466

 
$
23,622

 
$
63,939

 
$
105,711