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Share-based compensation (Tables)
3 Months Ended
Mar. 31, 2019
Share-based compensation  
Schedule of share-based compensation expense by classification included in consolidated statements of operations and comprehensive loss

 

 

 

 

 

 

 

    

 

Three months ended March 31, 

 

    

2019

    

2018

 

 

(in thousands)

Research and development

 

$

1,980

 

$

806

Selling, general and administrative

 

 

2,298

 

 

1,721

Total

 

$

4,279

 

$

2,527

 

Schedule of share-based compensation expense

 

 

 

 

 

 

 

 

 

Three months ended March 31, 

 

    

2019

    

2018

 

 

(in thousands)

Award type

 

 

 

 

 

 

Share options

 

$

2,076

 

$

1,059

Restricted share units (“RSUs”)

 

 

930

 

 

746

Performance share units (“PSUs”)

 

 

1,272

 

 

722

Total

 

$

4,279

 

$

2,527

 

Schedule of unrecognized compensation cost related to unvested awards

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted-average

 

    

Unrecognized

    

remaining

 

 

compensation

 

period for

 

 

costs

 

     recognition     

Award type

 

(in thousands)

 

(in years)

Share options

 

$

22,627

 

3.25

Restricted share units

 

 

7,968

 

2.31

Performance share units

 

 

9,661

 

2.22

Total

 

$

40,256

 

2.82

 

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

 

 

 

 

 

 

 

Three months ended March 31, 

Assumptions

    

2019

 

2018

Expected volatility

 

75%

 

75%

Expected terms (in years)

 

10 years

 

10 years

Risk free interest rate

 

2.80% - 2.87%

 

2.77% - 2.99%

Expected dividends

 

0%

 

0%

 

Summary of RSUs activity

 

 

 

 

 

 

 

 

 

 

RSU

 

 

 

 

 

Weighted average

 

 

 

 

 

grant-date fair

 

    

Number of shares

    

value

Non-vested at December 31, 2018

 

 

412,321

 

$

16.49

Granted

 

 

145,004

 

$

33.62

Vested

 

 

(165,017)

 

$

12.41

Forfeited

 

 

(13,833)

 

$

12.25

Non-vested at March 31, 2019

 

 

378,475

 

$

24.99

 

 

 

 

 

 

 

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

 

 

 

 

$

4.9

 

Summary of PSUs activity

 

 

 

 

 

 

 

 

 

 

PSU

 

 

 

 

 

Weighted average

 

 

 

 

 

grant-date fair

 

    

Number of 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 March 31, 2019

 

 

486,467

 

$

17.80

PSUs awarded but not yet earned

 

 

96,389

 

$

59.65

Total non-vested and discretionary PSUs

 

 

582,856

 

$

24.72

 

 

 

 

 

 

 

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

 

 

 

 

$

9.9

 

2014 Plan  
Share-based compensation  
Summary of option activity

 

 

 

 

 

 

 

 

Options

 

 

Number of

 

Weighted average

 

    

shares

    

exercise price

 

 

 

 

 

 

Outstanding at December 31, 2018

 

2,673,712

 

$

15.09

Granted

 

502,526

 

$

34.35

Forfeited

 

(41,479)

 

$

11.77

Expired

 

(75)

 

$

7.49

Exercised

 

(165,240)

 

$

12.35

Outstanding at March 31, 2019

 

2,969,444

 

$

18.54

 

 

 

 

 

 

Fully vested and exercisable at March 31, 2019

 

1,176,022

 

$

11.73

Outstanding and expected to vest at March 31, 2019

 

1,793,422

 

$

23.01

 

 

 

 

 

 

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

 

 

 

$

10.1

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

 

 

 

$

2.0