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Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Stock-based Compensation  
Summary of performance share units activity

Weighted-Average

Shares

Grant Date Fair Value

Outstanding at December 31, 2021

353,100

$

31.77

Granted

241,550

24.12

Vested

(109,774)

29.23

Forfeited

Performance adjustment

(584)

29.14

Outstanding at March 31, 2022

484,292

$

28.70

Summary of restricted stock units activity

Weighted-Average

Shares

Grant Date Fair Value

Outstanding at December 31, 2021

1,620,023

$

22.48

Granted

1,009,872

17.68

Vested

(453,276)

22.27

Forfeited

(137,440)

21.03

Outstanding at March 31, 2022

2,039,179

$

20.24

Summary of stock option activity

 

 

 

Weighted-

 

 

Weighted-

 

Average

 

Average

 

Remaining

Aggregate

Exercise Price

 

Contractual

Intrinsic

    

Shares

    

per Share

    

Term (in years)

    

Value

Outstanding at December 31, 2021

 

2,728,169

$

18.33

 

5.8

$

6,070

Granted

 

Exercised

 

(190,074)

17.15

Cancelled

 

(136,985)

22.22

Outstanding at March 31, 2022

 

2,401,110

$

18.20

 

6.0

$

7,860

Exercisable at March 31, 2022

 

2,010,445

$

18.14

 

5.7

$

6,930

Summary of stock-based compensation

Three Months Ended March 31,

2022

2021

Research and development

$

1,591

    

1,217

Selling, general and administrative

 

4,544

5,662

Total stock-based compensation expense

$

6,135

$

6,879