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Inventory (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Tables Abstract  
Inventory (Tables)

Inventory consists of the following:

      March 31,     December 31,
(in thousands)     2019     2018
Raw materials   $ 32    $ 32 
Finished goods     1,030      1,077 
    $ 1,062    $ 1,109