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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventories consist of the following:

 

 

 

March 31,

 

 

December 31,

 

(in thousands)

 

2019

 

 

2018

 

Raw materials

 

$

341

 

 

$

358

 

Work-in-process

 

 

434

 

 

 

500

 

Total inventories

 

$

775

 

 

$

858