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Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 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	​	(126,081)	​	​	29.12
Forfeited	​	(22,104)	​	​	29.60
Performance adjustment	​	1,305	​	​	28.96
Outstanding at September 30, 2022	​	447,770	​	$	28.71

Summary of restricted stock units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding at December 31, 2021	​	1,620,023	​	$	22.48
Granted	​	1,272,497	​	​	17.48
Vested	​	(565,669)	​	​	21.93
Forfeited	​	(366,691)	​	​	20.58
Outstanding at September 30, 2022	​	1,960,160	​	$	19.75

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		(302,752)	​	​	16.34	​	​	​	​	​
Cancelled		(268,916)	​	​	21.38	​	​	​	​	​
Outstanding at September 30, 2022		2,156,501	​	$	18.23		5.4	​	$	2,142
Exercisable at September 30, 2022		1,969,414	​	$	18.18	​	5.2	​	$	2,023

Summary of stock-based compensation

​

​	​	​	​	​	​	​	​	​	​	​	​
​	Three Months Ended September 30,					​	Nine Months Ended September 30,
​	2022		​	2021		​	2022		​	2021
Research and development	$	—		$	233	​	$	1,591		$	2,697
Selling, general and administrative		5,377	​	​	5,715	​		15,613	​	​	16,646
Total stock-based compensation expense	$	5,377	​	$	5,948	​	$	17,204	​	$	19,343

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the change in restricted stock units (RSUs).

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