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4. Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
             June 30,    December 31,
            2017   2016
Raw materials          $ 5,578   $ 5,235 
Work in progress           1,541    1,636 
Finished goods           3,488    4,587 
Supplies           1,121    717 
Total Inventories           11,728    12,175 
Inventory reserve           (398)   (399)
Net Inventories          $ 11,330   $ 11,776