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Property and equipment (Tables)
12 Months Ended
Dec. 31, 2019
Property And Equipment Net Tables  
Components of Property, Plant and Equipment

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

      December 31,
      2019     2018
Production equipment   $ 6,969    $ 7,124 
Leasehold improvements     913      909 
Computer hardware and software/lab equipment     6,165      6,082 
Office furniture and equipment     1,345      1,342 
      15,392      15,457 
Less: Accumulated depreciation     (13,543)     (12,464)
    $ 1,849    $ 2,993