XML 32 R20.htm IDEA: XBRL DOCUMENT v3.20.2
Note 2 - Net Loss Per Common Share (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2020

  

2019

  

2020

  

2019

 

Shares of common stock subject to outstanding options

  4,823,917   5,721,801   4,792,022   5,696,450 

Employee stock purchase plan

  26,416   29,471   23,007   27,582 

Restricted stock units

  945,325   752,607   941,776   646,274 

Total common stock equivalents

  5,795,658   6,503,879   5,756,805   6,370,306