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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories for the period The following table summarizes the components of inventories:
 
(in thousands)
 
June 30, 2019
 
December 31, 2018
Raw materials
 
$
4,018

 
$
1,291

Work-in-process
 
3,320

 
3,485

Finished goods
 
3,057

 
3,614

Total inventories
 
$
10,395

 
$
8,390