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Share-based compensation (Tables)
 12 Months Ended
Dec. 31, 2022
Share-based compensation  
Schedule of information about share-based awards

The following table provides information about share-based awards as of December 31, 2022 and 2021:

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2018 Stock Option Plan

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2020 U.S. Stock Option Plan

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2021 Long-term Incentive Option Plan

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Weighted 

    

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​

    

Weighted 

    

​

    

​

    

Weighted 

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​

​

​

Weighted 

​

average 

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​

​

Weighted 

​

average 

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​

​

Weighted 

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average 

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Number 

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average 

​

remaining 

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​

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average 

​

remaining 

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average 

​

remaining 

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​

of 

​

exercise 

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contractual 

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Number of 

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exercise 

​

contractual 

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Number of 

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exercise 

​

contractual 

​

​

options

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price $

 

term (yrs)

​

options

​

price $

 

term (yrs)

​

options

​

price $

 

term (yrs)

Outstanding at January 1, 2021

 

620,347

 

0.01

 

(*)

 

1,069,198

 

2.76

 

9.50

 

—

 

—

 

—

Granted

 

—

 

—

 

​

​

493,938

 

12.69

 

9.21

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1,307,150

 

6.03

 

9.90

Exercised

 

—

 

—

 

​

​

—

 

—

 

​

​

—

 

—

 

​

Forfeited

 

—

 

—

 

​

​

—

 

—

 

​

​

—

 

—

 

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Outstanding at December 31, 2021

 

620,347

 

0.01

 

(*)

 

1,563,136

 

5.90

 

8.90

 

1,307,150

 

6.03

 

9.90

Granted

 

—

 

—

 

​

​

—

 

—

 

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​

2,358,458

 

4.01

​

9.79

Exercised

 

(16,073)

 

0.01

 

​

​

(6,124)

 

2.76

 

​

​

—

 

—

 

  

Forfeited

 

(3,817)

 

0.01

 

​

​

(284,933)

 

13.46

 

​

​

(258,014)

 

5.75

 

  

Outstanding at December 31, 2022

 

600,457

 

0.01

 

(*)

 

1,272,079

 

4.22

 

7.83

 

3,407,594

 

4.66

 

9.54

Exercisable at December 31, 2022

 

387,565

 

​

 

​

​

717,532

 

​

 

  

​

470,454

 

​

 

  

(*) contract term does not have fixed end date

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Schedule of assumptions used in the measurement of the fair values and the weighted average fair value of the share options granted

The assumptions used in the measurement of the fair values and the weighted average fair value of the share options granted during the years ended on December 31, 2022, 2021 and 2020:

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December 31, 2022

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December 31, 2021

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December 31, 2020

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NL & US

    

NL

    

US

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NL

Expected annual average volatility

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83.9%

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80.1%

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80.1%

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75.5% - 90.0%

Expected life, years

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6.08

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6.08

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6.08

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3.92

Fair value of the common share

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$

1.71 - 3.91

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$

3.42 - 5.23

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$

3.12 - 8.71

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$

2.10 - 2.76

Exercise price

​

$

2.34 - 5.50

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$

5.10 - 7.77

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$

5.10 - 15.00

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$

0

Dividend yield

​

​

—

​

​

—

​

​

—

​

​

—

Risk-free interest rate

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1.65% - 3.78%

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(0.30%) - (0.53%)

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0.94% - 1.34%

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(0.62%)

Weighted average grant date fair value

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$

4.01

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$

3.61

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$

5.95

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$

2.71

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