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Share-based compensation (Tables)
12 Months Ended
Dec. 31, 2022
Share-based compensation  
Schedule of share-based compensation expense by classification included in consolidated statements of operations and comprehensive loss

    

Year ended December 31, 

2022

2021

2020

(in thousands)

Cost of manufacturing services revenue

$

323

$

$

Research and development

18,402

12,834

11,995

Selling, general and administrative

15,479

12,801

9,836

Total

$

34,204

$

25,635

$

21,831

Schedule of share-based compensation expense

Year ended December 31, 

2022

2021

2020

(in thousands)

Award type/ESPP

Share options

$

13,425

$

12,477

$

11,434

Restricted share units

15,486

11,347

7,364

Performance share units

5,267

1,783

2,990

Employee share purchase plan

26

28

43

Total

$

34,204

$

25,635

$

21,831

Schedule of unrecognized compensation cost related to unvested awards

    

Unrecognized

  

Weighted average

    

share-based

    

remaining

compensation

period for

expense

     recognition     

(in thousands)

(in years)

Award type

Share options

$

24,420

2.48

Restricted share units

24,924

1.90

Performance share units

184

0.14

Total

$

49,528

2.18

Schedule of weighted-average assumptions for fair value of option issued

Year ended December 31, 

Assumptions

    

2022

    

2021

2020

Expected volatility

70%

75%

70%

Expected terms

10 years

10 years

10 years

Risk free interest rate

2.12% - 4.16%

1.21 - 1.86%

0.76% - 1.44%

Expected dividend yield

0%

0%

0%

Summary of RSUs activity

RSU

    

    

Weighted average

Number of

grant-date fair

ordinary shares

value

Non-vested at December 31, 2021

710,617

$

38.89

Granted

1,604,533

$

16.10

Vested

(292,688)

$

39.31

Forfeited

(203,688)

$

23.39

Non-vested at December 31, 2022

1,818,774

$

20.46

Total weighted average grant date fair value of RSUs granted during the period (in $ millions)

$

25.8

Granted to directors and officers during the period (shares, $ in millions)

380,288

$

6.0

Summary of PSUs activity

PSU

    

    

Weighted average

Number of

grant-date fair

ordinary shares

value

Non-vested at December 31, 2021

632,930

$

33.54

Granted

34,700

$

15.11

Vested

(213,145)

$

40.46

Forfeited

(53,795)

$

29.35

Non-vested at December 31, 2022

400,690

$

28.82

Total weighted average grant date fair value of PSUs granted during the period (in $ millions)

$

0.5

2014 Plan.  
Share-based compensation  
Summary of option activity

Options

Number of

Weighted average

Weighted average

Aggregate intrinsic

    

ordinary shares

    

exercise price

    

remaining contractual life

    

value

in years

(in thousands)

Outstanding at December 31, 2021

3,308,325

$

31.02

7.05

$

8,660

Granted

1,426,966

$

15.90

Forfeited

(204,224)

$

38.29

Expired

(154,794)

$

36.86

Exercised

(138,356)

$

7.81

Outstanding at December 31, 2022

4,237,917

$

26.13

7.14

17,848

Thereof, fully vested and exercisable on December 31, 2022

2,139,360

$

28.82

5.45

8,339

Thereof, outstanding and expected to vest after December 31, 2022

2,098,557

$

23.38

8.86

9,509

Outstanding and expected to vest after December 31, 2021

1,521,500

$

38.71

Total weighted average grant date fair value of options issued during the period (in $ millions)

$

12.9

Granted to directors and officers during the period (options, grant date fair value $ in millions)

672,908

$

5.9

Proceeds from option sales during the period (in $ millions)

$

1.3

Summary of information about weighted average grant-date fair value of options granted

    

    

Weighted average

Options

grantdate fair value

Granted, 2022

 

1,426,966

$

9.04

Granted, 2021

 

1,174,893

20.95

Granted, 2020

 

653,852

28.08

Vested, 2022

652,635

22.27

Forfeited, 2022

(204,224)

22.17

Summary of summarizes information about the weighted average grant-date fair value of options outstanding and expected to vest

    

    

Weighted average

Options

grantdate fair value

Outstanding and expected to vest, 2022

 

2,098,557

$

13.46

Outstanding and expected to vest, 2021

 

1,521,500

22.52

Summary of information about options exercised

    

Exercised

    

during the year

Intrinsic value

(in thousands)

2022

 

138,356

$

1,848

2021

 

241,496

 

5,046

2020

 

498,678

 

11,927

Restricted share units ("RSUs")  
Share-based compensation  
Summary of information about weighted average grant-date fair value of options granted

    

Granted

    

Weighted average

during the year

grantdate fair value

2022

 

1,604,533

$

16.10

2021

 

574,921

36.14

2020

 

376,799

48.18

Summary of information about the total fair value of stock that vested

Total fair value

(in thousands)

2022

$

5,104

2021

 

8,063

2020

 

12,156

Performance Share Awards  
Share-based compensation  
Summary of information about weighted average grant-date fair value of options granted

    

Granted

    

Weighted average

during the year

grantdate fair value

2022

 

34,700

$

15.11

2021

 

555,600

$

30.19

2020

 

91,003

$

57.56

Summary of information about the total fair value of stock that vested

Total fair value

(in thousands)

2022

$

4,450

2021

 

5,074

2020

 

21,852