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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2022

Summary of information related to stock-based incentive compensation plans

​

​	​	​
​	​	​
​	​	December 31, 2022
Shares available for future issuance under the 2017 Omnibus Incentive Plan	​	1,475
Shares available for future issuance under the Employee Stock Purchase Plan	​	619

​

Schedule of stock-based compensation

​

​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2022			2021			2020
Stock-based compensation expense	​	$	19,849	​	$	15,739	​	$	12,272

​

Schedule of changes in unvested RSUs

​

​	​	​	​	​	​
​	​	Year Ended December 31, 2022
​		​		Weighted-
​	​	​	​	Average
​	​	Number of	​	Grant Date
​	​	RSUs	​	Fair Value
RSUs outstanding at beginning of period		627	​	$	76.37
RSUs granted		593	​	$	74.62
RSUs vested		(162)	​	$	83.16
RSUs forfeited		(255)	​	$	61.39
RSUs outstanding at end of period		803	​	$	78.46

​

Summary of changes in stock options

Changes in our stock options were as follows:

​

​	​	​	​	​	​	​	​
​	​	Year Ended December 31, 2022				​	​
​		​		Weighted-			Weighted-
​	​	​	​	Average		​	Average
​	​	Number of	​	Exercise Price		​	Remaining
​	​	Options	​	per Share		​	Contractual Life
Options outstanding at beginning of period		112	​	$	24.41	​	​
Options granted		76	​	$	85.97	​	​
Options exercised		(37)	​	$	23.26	​	​
Options outstanding at end of period		151	​	$	55.48	​	5.63 years
Options vested at end of period		75	​	$	24.97	​	2.04 years

​

Stock Option

Schedule of stock-based compensation

​

​	​	​	​
​	​	Year Ended December 31,	​
Stock Options		2022
Risk-free interest rate		2.18	%
Expected dividend yield rate		0.5	%
Expected term		4.7 years
Expected volatility		48.6	%
Weighted average grant date fair value of options granted	​	$ 35.84	​

​

Employee Stock

Schedule of stock-based compensation

​

​	​	​	​	​	​	​	​
​	​	Years Ended December 31,					​
ESPP		2022		2021		2020
Risk-free interest rates		1.63% - 4.65%	%	0.04% - 0.10	%	0.10% - 0.18%	%
Expected dividend yield rate		0.1	%	—	%	—	%
Expected term		0.5 years		0.5 years		0.5 years	​
Expected volatility		43.7	%	42.7	%	70.1	%

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- Definition

The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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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