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Property and equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property And Equipment Net Tables  
Components of Property, Plant and Equipment

Property and equipment consists of the following (in thousands):

      December 31,
      2020     2019
Production equipment   $ 7,210    $ 6,969 
Leasehold improvements     913      913 
Computer hardware and software/lab equipment     6,226      6,165 
Office furniture and equipment     1,345      1,345 
      15,694      15,392 
Less: Accumulated depreciation     (13,811)     (13,543)
    $ 1,883    $ 1,849