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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Revenue:
 
 
 
 
 
 
 
Products
$
33,632

 
$
38,213

 
$
75,703

 
$
78,142

Services
1,060

 
1,333

 
2,246

 
2,473

 
$
34,692

 
$
39,546

 
$
77,949

 
$
80,615

Operating expenses (excluding depreciation and amortization):
 
 
 
 
 
 
Products
$
37,798

 
$
34,062

 
$
81,877

 
$
69,247

Services
508

 
1,482

 
1,027

 
2,952

 
$
38,306

 
$
35,544

 
$
82,904

 
$
72,199