Quarterly report pursuant to Section 13 or 15(d)

Inventory (Tables)

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Inventory (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory

Inventory consisted of the following (in thousands):

 

    March 31,     December 31,  
    2018     2017  
             
Finished goods   $ 18     $ 512  
Work in process     58       182  
Raw materials     857       545  
Total inventory   $ 933     $ 1,239