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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Stock-based Compensation

Summary of performance share units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding at December 31, 2022	​	447,770	​	$	28.71
Granted	​	216,500	​	​	38.71
Vested	​	(223,170)	​	​	27.99
Forfeited	​	—	​	​	—
Performance adjustment	​	62,780	​	​	27.14
Outstanding at March 31, 2023	​	503,880	​	$	33.13

​

Summary of restricted stock units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding at December 31, 2022	​	2,047,571	​	$	19.67
Granted	​	1,093,296	​	​	26.82
Vested	​	(552,734)	​	​	20.42
Forfeited	​	(132,214)	​	​	21.66
Outstanding at March 31, 2023	​	2,455,919	​	$	22.58

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, 2022		1,683,805	​	$	18.84		5.5	​	$	7,953
Exercised		(234,132)	​	​	16.36	​	​	​	​	​
Cancelled		(5,677)	​	​	20.01	​	​	​	​	​
Outstanding at March 31, 2023		1,443,996	​	$	19.24		5.0	​	$	7,074
Exercisable at March 31, 2023		1,358,588	​	$	19.20	​	4.9	​	$	6,730

​

Summary of stock-based compensation

​

​	​	​	​	​	​
​	Three Months Ended March 31,
​	2023		​	2022
Research and development	$	—		$	1,591
Selling, general and administrative		6,035	​	​	4,544
Total stock-based compensation expense	$	6,035	​	$	6,135

​

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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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