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

Inventories consist of the following (in thousands):

 

 

 

June 30,

2018

 

 

December 31,

2017

 

Raw materials

 

$

1,111

 

 

$

572

 

Work-in-process

 

 

1,502

 

 

 

1,273

 

Finished goods

 

 

1,063

 

 

 

812

 

Total inventory

 

$

3,676

 

 

$

2,657