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Earnings Per Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share
Note 7 − Earnings Per Share

Basic earnings per share are based on the weighted average number of shares outstanding for a period. Diluted earnings per share are based upon the weighted average number of shares and potentially dilutive common shares outstanding. Potential common shares outstanding principally include stock options, under our stock plan and warrants. During 2018, 2017 and 2016 we incurred losses; therefore, the effect of any common stock equivalent would be anti-dilutive during those periods.

The table below sets forth the basic and diluted loss per share calculations:

  
Year Ended December 31,
 
  
2018
  
2017
  
2016
 
Net loss
 
$
(25,406
)
  
(17,278
)
 
$
(28,569
)
Basic and diluted weighted average number of shares outstanding
  
62,986
   
58,354
   
55,985
 
Basic and diluted loss per share
 
$
(0.40
)
  
(0.30
)
 
$
(0.51
)