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Accrued liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Accrued Liabilities Tables  
Accrued liabilities (Tables)

Accrued liabilities consists of the following (in thousands):

      December 31,
      2018     2017
Bonuses   $ 1,475    $ 1,143 
Adverse purchase commitments         500 
Payroll and payroll taxes     608      631 
Compensated absences     493      436 
Warranty     25      153 
Relocation     22      90 
Deferred rent credit     178      37 
Separation agreement     241      359 
Prepayments from customers     1,585      1,738 
Other     975      777 
    $ 5,602    $ 5,864