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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories for the period
The following table summarizes the components of inventories:
(in thousands)
December 31, 2018
 
December 31, 2017
Raw materials
$
1,291

 
$
2,393

Work-in-process
3,485

 
1,450

Finished goods
3,614

 
780

Total inventories
$
8,390

 
$
4,623