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Note 6 - Net Loss Per Share
3 Months Ended
Mar. 31, 2016
Notes to Financial Statements  
Earnings Per Share [Text Block]
6.     Net Loss Per Share
 
The following summarizes the computation of basic and diluted net loss per share for the three months ended March 31, 2016 and 2015 (in thousands, except share and per share data):
 
    Three Months Ended March 31,
    2016   2015
Net loss   $ (10,257 )   $ (8,114 )
Weighted-average number of common shares—basic and diluted     32,292,106       27,641,565  
Net loss per share—basic and diluted   $ (0.32 )   $ (0.29 )
 
The following potentially dilutive securities outstanding, prior to the use of the treasury stock method or if-converted method, have been excluded from the computation of diluted weighted-average common shares outstanding, because including them would have had an anti-dilutive effect due to the losses reported.
 
    Three Month Ended March 31,
    2016   2015
Stock options     5,083,160       4,838,540  
Warrants to purchase common stock     -       208,333  
Total     5,083,160       5,046,873