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Share-based compensation (Tables)
6 Months Ended
Jun. 30, 2021
Share-based compensation  
Schedule of share-based compensation expense by classification included in consolidated statements of operations and comprehensive loss

    

Three months ended June 30, 

Six months ended June 30, 

    

2021

    

2020

2021

2020

(in thousands)

(in thousands)

Research and development

$

3,286

$

2,889

$

5,960

$

5,271

Selling, general and administrative

3,735

2,825

6,815

4,783

Total

$

7,021

$

5,714

$

12,775

$

10,054

Schedule of share-based compensation expense

Three months ended June 30, 

Six months ended June 30, 

    

2021

    

2020

2021

2020

(in thousands)

(in thousands)

Award type

Share options

$

3,350

$

2,746

$

6,190

$

4,954

Restricted share units

3,222

2,209

5,782

3,653

Performance share units

449

759

803

1,447

Total

$

7,021

$

5,714

$

12,775

$

10,054

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

$

34,855

2.99

Restricted share units

24,960

2.25

Performance share units

792

0.58

Total

$

60,607

2.66

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

Three months ended June 30, 

    

Six months ended June 30, 

Assumptions

    

2021

    

2020

    

2021

    

2020

Expected volatility

75%

70%

75%

70%

Expected terms

10 years

10 years

10 years

10 years

Risk free interest rate

1.72% - 1.85%

0.76% - 0.83%

1.21% - 1.85%

0.76% - 1.44%

Expected dividend yield

0%

0%

0%

0%

Summary of RSUs activity

RSU

    

    

Weighted average

Number of

grant-date fair

ordinary shares

value

Non-vested at December 31, 2020

467,344

$

43.56

Granted

481,821

$

36.50

Vested

(145,203)

$

39.89

Forfeited

(31,067)

$

42.86

Non-vested at June 30, 2021

772,895

$

39.87

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

$

17.6

Summary of PSUs activity

PSU

    

    

Weighted average

Number of

grant-date fair

ordinary shares

value

Non-vested at December 31, 2020

212,614

$

42.32

Vested

(132,368)

$

33.09

Forfeited

(2,916)

$

57.56

Non-vested at June 30, 2021

77,330

$

57.56

2014 Plan  
Share-based compensation  
Summary of option activity

Options

Number of

Weighted average

    

ordinary shares

    

exercise price

Outstanding at December 31, 2020

2,659,279

$

28.13

Granted

914,118

$

36.36

Forfeited

(74,397)

$

43.19

Expired

(9,093)

$

44.14

Exercised

(71,976)

$

12.65

Outstanding at June 30, 2021

3,417,931

$

30.29

Thereof, fully vested and exercisable at June 30, 2021

1,774,059

$

21.68

Thereof, outstanding and expected to vest after June 30, 2021

1,643,872

$

39.58

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

$

19.4

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

$

0.9