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4. Inventories, net (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Components of inventory
   March 31, 2019  December 31, 2018
Finished goods  $3,612   $2,004 
Work in process   5,274    5,750 
Raw materials   3,276    3,712 
   $12,162   $11,466