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Inventories (Tables)
9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consist of the following:  (in thousands) 
   September 30,   December 31, 
   2016   2015 
Inventory work-in-process, January 1  $1,326   $ 
Production       1,443 
Transfer to other assets   (1,326)    
Spoilage       (117)
Inventory work-in-process, end of period  $   $1,326