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Inventories (Tables)
12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventories consist of the following:   (in thousands)  
    2015     2014  
Inventory work-in-process, January 1   $     $  
Production     1,443        
Spoilage     (117 )      
Inventory work-in-process, December 31   $ 1,326     $