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4. Inventories, net (Tables)
6 Months Ended
Jun. 30, 2018
Inventories Net Tables  
Components of inventory
  

June 30,

2018

  December 31,
2017
Finished goods  $2,201   $2,825 
Work in process   6,408    7,111 
Raw materials   4,172    4,422 
   $12,781   $14,358