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Inventories
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Inventories
(2) Inventories

Inventories consist of the following:

 

(in thousands)    March 31,
2018
     December 31,
2017
 

Raw materials

   $ 275      $ 298  

Work-in-process

     682        721  

Finished goods

     323        229  
  

 

 

    

 

 

 

Total inventories

   $ 1,280      $ 1,248  
  

 

 

    

 

 

 
(4) Inventories

Inventories consist of:

 

(in thousands)

   December 31,
2017
     December 31,
2016
 

Raw materials

   $ 298      $ 346  

Work-in-process

     721        214  

Finished goods

     229        100  
  

 

 

    

 

 

 

Total Inventory

   $ 1,248      $ 660