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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories for the period
The following table summarizes the components of inventories:
 
(in thousands)
June 30, 2018
 
December 31, 2017
Work-in-process
$
5,506

 
$
3,843

Finished goods
2,263

 
780

Total inventories
$
7,769

 
$
4,623