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Note 13 - Net Loss Per Share
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Earnings Per Share [Text Block]
(
13
)
Net Loss per Share
 
The following table sets forth the computation of the basic and diluted net loss per share for the years ended
December 31, 2018,
2017
and
2016
(in thousands, except share and per share data):
 
   
Years ended December 31,
  
   
2018
    
2017
    
2016
  
Numerator:
                        
Net loss
   $
(13,987
 )   $
(12,308
 )   $
(10,310
 )
Denominator:
                        
Weighted average shares used to compute net loss per share, basic and diluted
    
38,377,606
      
38,160,543
      
8,368,284
  
Net loss per share, basic and diluted
   $
(0.36
 )   $
(0.32
 )   $
(1.23
 )
 
 
The following weighted-average outstanding common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been antidilutive:
 
   
December 31,
  
   
2018
    
2017
    
2016
  
Stock options to purchase common stock
    
5,477,364
      
4,213,100
      
3,491,937
  
Unvested restricted stock units
    
267,359
      
97,996
      
-
  
Common stock warrants    
2,666,666
      
-
      
-
  
Total
    
8,411,389
      
4,311,096
      
3,491,937