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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventories consist of the following:

 

 

 

June 30,

 

 

December 31,

 

(in thousands)

 

2018

 

 

2017

 

Raw materials

 

$

339

 

 

$

298

 

Work-in-process

 

 

755

 

 

 

721

 

Finished goods

 

 

156

 

 

 

229

 

Total inventories

 

$

1,250

 

 

$

1,248