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Quarterly financial information (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2018
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 2018
      December 31,     September 30,     June 30,     March 31,
Revenue   $ 1,833    $ 11,572    $ 2,014    $ 2,188 
Gross profit     (2,606)     8,927      333      315 
Net income (loss)     (11,948)     289      (8,459)     (7,132)
Net loss per share, basic and diluted     (0.13)     -       (0.10)     (0.09)
                         
      Fiscal Year 2017
      December 31,     September 30,     June 30,     March 31,
Revenue   $ 2,302    $ 5,425    $ 1,339    $ 568 
Gross profit     (248)     (278)     346      (48)
Net income (loss)     (8,119)     (5,762)     (5,656)     (5,949)
Net loss per share, basic and diluted     (0.10)     (0.08)     (0.08)     (0.09)