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2. Inventories, net (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of components of inventory
    December 31,  
    2020     2019  
Finished goods   $ 1,975     $ 3,864  
Work in process      3,288       6,122  
Raw materials     4,178       3,527  
    $ 9,441     $ 13,513  
Schedule of changes in allowance for obsolete or slow moving inventory
    Years Ended December 31,  
    2020     2019  
Balance, beginning of year   $ 823     $ 629  
Charged to cost of sales     126       194  
Disposal of inventory     (429 )      
Balance, end of year   $ 520     $ 823