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Share-Based Payments (Tables)
 9 Months Ended
Sep. 30, 2021
Summary of Stock Options Valuation Assumptions There have been no changes in the vesting conditions and method of valuation of the SO and RSU from that disclosed in Note 14 to the consolidated financial statements included in the Annual Report.
 
Stock option fair value assumptions during the nine months ended September 30, 2021
  
Weighted average share price at grant date in €
      9.3  
Weighted average expected volatility
      90.9%  
Weighted average risk-free interest rate
      (0.36)%  
Weighted average expected term (in years)
      6  
Dividend yield
      —    
Weighted average fair value of stock options in €
      6.9  
Summary of Fair Value of the Warrants has been Estimated Unsing the Cox-Ross Rubinstein Binomial Option Pricing Model The fair value of the warrants has been estimated unsing the
Cox-Ross
Rubinstein binomial option pricing model.
Warrant fair value assumptions during the nine months ended September 30, 2021
  
Weighted average share price at grant date in €
      10.75  
Weighted average expected volatility
      90.0%  
Weighted average risk-free interest rate
      (0.53)%
Weighted average expected term (in years)
      3.21  
Dividend yield
      —    
Weighted average fair value of warrants in €
      —    
Summary of RSU Activity
The changes in number of BSA/BSPCE/SO/RSU are as follows:
 
    
Number of outstanding
  
    
BSA
     
BSPCE
     
SO
     
RSU
  
Balance as of December 31, 2020
   
 
218,008
 
   
 
5,500
 
   
 
2,610,510
 
   
 
1,118,745
 
Granted during the period
      39,185        —          75,600        44,900  
Forfeited during the period
      —          —          (100,400 )       (59,500 ) 
Exercised/released during the period
      —          (5,500 )       —          —    
Expired during the period
      (500 )       —          —          —    
    
 
 
     
 
 
     
 
 
     
 
 
  
Balance as of September 30, 2021
   
 
256,693
 
   
 
—  
 
   
 
2,585,710
 
   
 
1,104,145
 
    
 
 
     
 
 
     
 
 
     
 
 
  
Summary of Share-Based Payments Expenses
Share-based payments expenses reflected in the condensed consolidated statements of operations is as follows:
 
           
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
  
           
2021
    
2020
    
2021
    
2020
  
Research & development
      SO        (273 )      (6 )      (952 )      1,144  
       RSU        (660 )      (102 )      (795 )      (628 ) 
Sales & marketing
      SO        (60 )      186       (172 )      2,063  
       RSU        (27 )      (4 )      (75 )      (12 ) 
General & administrative
      SO        (439 )      25       (1,791 )      609  
       RSU        (92 )      (24 )      (293 )      (211 ) 
             
 
 
    
 
 
    
 
 
    
 
 
  
Total share-based compensation (expense)
            
 
(1,551
) 
  
 
74
 
  
 
(4,078
) 
  
 
2,965