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Inventory (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Tables  
Inventory (Tables)

Inventory consists of the following:

      March 31,     December 31,
(in thousands)     2018     2017
Raw materials   $ 53    $ 53 
Finished goods     4,452      4,488 
    $ 4,505    $ 4,541