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2. Inventories, net (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of components of inventory
    December 31,  
    2019     2018  
Finished goods   $ 3,864     $ 2,004  
Work in process      6,122       5,750  
Raw materials     3,527       3,712  
    $ 13,513     $ 11,466  
Schedule of changes in allowance for obsolete or slow moving inventory
    Years Ended December 31,  
    2019     2018  
Balance, beginning of year   $ 629     $ 789  
Charged to cost of sales     194       (38 )
Disposal of inventory           (122 )
Balance, end of year   $ 823     $ 629