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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Stock-based Compensation

Summary of performance share units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding as of 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 as of December 31, 2023	​	503,880	​	$	33.13

Summary of restricted stock units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding as of December 31, 2022	​	2,047,571	​	$	19.67
Granted	​	1,278,256	​	​	26.25
Vested	​	(675,647)	​	​	19.83
Forfeited	​	(206,273)	​	​	21.91
Outstanding as of December 31, 2023	​	2,443,907	​	$	22.88

Summary of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		Weighted-		​	​
​	​	​		​	Weighted-		Average	​	​	​
​	​	​		​	Average		Remaining	​	​	Aggregate
​	​	​	​	​	Exercise Price		Contractual	​	​	Intrinsic
​		Shares		​	per Share		Term (in years)		​	Value
Outstanding as of December 31, 2022		1,683,805	​	$	18.84		5.5	​	$	7,953
Exercised		(498,008)	​	​	17.34	​	​	​	​	​
Cancelled		(9,047)	​	​	18.90	​	​	​	​	​
Outstanding as of December 31, 2023		1,176,750	​	$	19.48		4.3	​	$	13,297
Exercisable as of December 31, 2023		1,158,209	​	$	19.45		4.3	​	$	13,120

Schedule of fair value assumption using Black-Scholes option-pricing model

​

​	​	​	​	​	​	​	​	​
​	Years Ended December 31,
​	2023		​	2022		​	2021
Risk-free interest rate	—	%	​	—	%	​	0.7	%
Volatility	—	%	​	—	%	​	67.2	%
Expected term (years)	—	​	​	—	​	​	6.0	​
Expected dividend yield	—	%	​	—	%	​	—	%

Summary of stock-based compensation

​

​	​	​	​	​	​	​	​	​
​	Years Ended December 31,
​	2023		​	2022		​	2021
Research and development	$	—		$	1,591		$	3,422
Selling, general and administrative		27,136	​	​	21,283	​	​	20,833
Total stock-based compensation expense	$	27,136	​	$	22,874	​	$	24,255

​

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares.

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