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

Inventories consist of the following (in thousands):

 

 

 

September 30,

2018

 

 

December 31,

2017

 

Raw materials

 

$

951

 

 

$

572

 

Work-in-process

 

 

732

 

 

 

1,273

 

Finished goods

 

 

1,102

 

 

 

812

 

Total inventory

 

$

2,785

 

 

$

2,657