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Quarterly financial information (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Tables  
Selected Quarterly Financial Data (Unaudited) (Tables)

The following table presents our unaudited quarterly financial information for the years ending December 31, 2015 and 2014 (in thousands, except per share data):

      Fiscal Year 2015
      December 31,     September 30,     June 30,     March 31,
Revenue   $ 1,846    $ 2,398    $ 4,043    $ 901 
Gross profit     379      585      1,187      (143)
Net loss     (4,298)     (3,513)     (2,769)     (3,962)
Net loss per share, basic and diluted     (0.09)     (0.07)     (0.06)     (0.09)
                         
      Fiscal Year 2014
      December 31,     September 30,     June 30,     March 31,
Revenue   $ 687    $ 968    $ 611    $ 1,219 
Gross profit     178      600      443      1,220 
Net loss     (3,346)     (3,355)     (3,401)     (8,018)
Net loss per share, basic and diluted     (0.08)     (0.08)     (0.08)     (0.23)