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Accrued liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Accrued Liabilities Tables  
Accrued liabilities (Tables)

Accrued liabilities consists of the following (in thousands):

      December 31,
      2020     2019
Bonuses   $ -    $ 201 
Payroll and payroll taxes     361      425 
Compensated absences     -      448 
Warranty     49      38 
Prepayments from customers     -      432 
Other     85      501 
    $ 495    $ 2,045