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Note 9 - Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Weighted average common shares outstanding:

                

Basic

  118,382   117,388   118,322   117,370 

Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants

            

Diluted

  118,382   117,388   118,322   117,370 
                 

Basic and diluted net loss per share attributable to common stockholders

 $(0.13) $(0.08) $(0.19) $(0.10)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Unvested stock (1)

  1,555   930   1,453   1,034 

Convertible preferred stock

  27,129   16,380   26,380   16,143 

Common Stock Warrants

  2,873   1,971   2,474   1,967 

IPO Warrants(2)

  12,082   12,082   12,082   12,082 

Total potentially dilutive common shares

  43,639   31,363   42,389   31,226