v3.19.2
Note 12 - Net Loss Per Share of Common Stock (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
June 30
,
 
   
201
9
   
201
8
 
RSUs, ESPP and stock options to purchase common stock
   
14,090,688
     
11,779,042
 
Common stock warrants
   
176,679
     
176,730