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

Inventories consist of the following (in thousands):

 

 

 

June 30,

2018

 

 

December 31,

2017

 

Raw materials

 

$

1,382

 

 

$

1,921

 

Work in process

 

 

4,060

 

 

 

3,299

 

Finished goods

 

 

838

 

 

 

1,106

 

Total

 

$

6,280

 

 

$

6,326