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2. Inventories, net (Tables)
 12 Months Ended
Dec. 31, 2018
Inventories Net  
Schedule of components of inventory
    December 31,  
    2018     2017  
             
Finished goods   $ 2,004     $ 2,825  
Work in process      5,750       7,111  
Raw materials     3,712       4,422  
    $ 11,466     $ 14,358  
Schedule of changes in allowance for obsolete or slow moving inventory
    Years Ended December 31,  
    2018     2017  
             
Balance, beginning of year   $ 789     $ 1,607  
Charged to cost of sales     (38 )     149  
Disposal of inventory     (122 )     (967 )
Balance, end of year   $ 629     $ 789