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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventory is comprised of the following (in thousands):
December 31,
 
2018
 
2017
Raw materials
 
$
1,438

 
$
1,285

Work-in-process
 
352

 

Inventories, net
 
$
1,790

 
$
1,285