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Share-based compensation (Tables)
6 Months Ended
Jun. 30, 2019
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, 

    

2019

    

2018

2019

2018

(in thousands)

Research and development

$

2,119

$

993

$

4,099

$

1,799

Selling, general and administrative

2,457

1,212

4,755

2,933

Total

$

4,576

$

2,205

$

8,854

$

4,732

Schedule of share-based compensation expense

Three months ended June 30, 

Six months ended June 30, 

    

2019

    

2018

2019

2018

(in thousands)

Award type

Share options

$

2,004

$

1,096

$

4,080

$

2,155

Restricted share units (“RSUs”)

995

540

1,925

1,286

Performance share units (“PSUs”)

1,577

569

2,849

1,291

Total

$

4,576

$

2,205

$

8,854

$

4,732

Schedule of unrecognized compensation cost related to unvested awards

    

Unrecognized

  

Weighted average

    

share-based

    

remaining

compensation

period for

expense

     recognition     

Award type

(in thousands)

(in years)

Share options

$

21,695

3.08

Restricted share units

6,955

2.10

Performance share units

9,867

2.12

Total

$

38,517

2.66

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

Three months ended June 30, 

Six months ended June 30, 

Assumptions

    

2019

2018

2019

2018

Expected volatility

75%

75%

75%

75%

Expected terms

10 years

10 years

10 years

10 years

Risk free interest rate

2.17% - 2.63%

2.99% - 3.07%

2.17% - 2.87%

2.77% - 3.07%

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, 2018

412,321

$

16.49

Granted

145,004

$

33.62

Vested

(186,417)

$

12.78

Forfeited

(14,516)

$

12.90

Non-vested at June 30, 2019

356,392

$

25.55

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

$

4.9

Summary of PSUs activity

PSU

    

    

Weighted average

Number of

grant-date fair

ordinary shares

value

Non-vested at December 31, 2018

377,169

$

16.73

Granted

132,362

$

31.71

Vested

(23,064)

$

5.76

Non-vested at June 30, 2019

486,467

$

17.80

PSUs awarded but not yet earned

96,389

$

78.15

Total non-vested and discretionary PSUs

582,856

$

27.78

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

$

11.7

2014 Plan  
Share-based compensation  
Summary of option activity

Options

Number of

Weighted average

    

ordinary shares

    

exercise price

Outstanding at December 31, 2018

2,673,712

$

15.09

Granted

530,276

$

36.05

Forfeited

(41,602)

$

11.88

Expired

(543)

$

12.26

Exercised

(218,087)

$

11.45

Outstanding at June 30, 2019

2,943,756

$

19.16

Fully vested and exercisable at June 30, 2019

1,264,254

$

12.37

Outstanding and expected to vest at June 30, 2019

1,679,502

$

24.27

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

$

11.2

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

$

2.5