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STOCK BASED COMPENSATION (Tables)

12 Months Ended

Dec. 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	​	(126,081)	​	​	29.12
Forfeited	​	(22,104)	​	​	29.60
Performance adjustment	​	1,305	​	​	28.96
Outstanding at December 31, 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	​	1,372,247	​	​	17.53
Vested	​	(573,204)	​	​	21.89
Forfeited	​	(371,495)	​	​	20.57
Outstanding at December 31, 2022	​	2,047,571	​	$	19.67

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
Exercised		(742,348)	​	​	15.93	​	​	​	​	​
Cancelled		(302,016)	​	​	21.35	​	​	​	​	​
Outstanding at December 31, 2022		1,683,805	​	$	18.84		5.5	​	$	7,953
Exercisable at December 31, 2022		1,545,610	​	$	18.82		5.4	​	$	7,394

​

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

​

​	​	​	​	​	​	​	​	​
​	Years Ended December 31,
​	2022		​	2021		​	2020
Risk-free interest rate	—	%	​	0.7	%	​	1.3	%
Volatility	—	%	​	67.2	%	​	66.2	%
Expected term (years)	—	​	​	6.0	​	​	6.0	​
Expected dividend yield	—	%	​	—	%	​	—	%

​

Summary of stock-based compensation

​

​	​	​	​	​	​	​	​	​
​	Years Ended December 31,
​	2022		​	2021		​	2020
Research and development	$	1,591		​	3,422		​	3,909
Selling, general and administrative		21,283	​	​	20,833	​	​	18,001
Total stock-based compensation expense	$	22,874	​	$	24,255	​	$	21,910

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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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