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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories for the period
The following table summarizes the components of inventories:
 
(in thousands)
 
March 31, 2019
 
December 31, 2018
Raw materials
 
$
1,321

 
$
1,291

Work-in-process
 
$
3,041

 
3,485

Finished goods
 
3,805

 
3,614

Total inventories
 
$
8,167

 
$
8,390