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Quarterly financial information (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Tables  
Selected Quarterly Financial Data (Unaudited) (Tables)

The following table summarizes our unaudited quarterly financial information for the periods shown below (in thousands, except per share data):

      Fiscal Year 2020
      December 31,     September 30,     June 30,     March 31,
Revenue   $ 395    $ 639    $ 587    $ 1,469 
Gross profit     395      639      588      70 
Net loss     (3,570)     (2,826)     (2,304)     (4,934)
Net loss per share, basic and diluted     (0.02)     (0.02)     (0.02)     (0.04)
                         
      Fiscal Year 2019
      December 31,     September 30,     June 30,     March 31,
Revenue   $ 4,605    $ 1,190    $ 1,240    $ 1,851 
Gross profit     1,179      (882)     (583)     608 
Net loss     (3,284)     (6,141)     (8,990)     (8,068)
Net loss per share, basic and diluted     (0.03)     (0.05)     (0.08)     (0.08)