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

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​

​

​

​

​

​

​

​

​

​

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

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​

​

​

​

​

​

​

​

​

​

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

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​

​

​

​

​

​

​

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​

​

​

 

​

 

​

​

 

Weighted-

 

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​

​

​

 

​

Weighted-

 

Average

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​

​

​

​

​

 

​

Average

 

Remaining

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​

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