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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2021

STOCK-BASED COMPENSATION

Schedule of stock-based compensation

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Three Months Ended June 30,

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Six Months Ended June 30,

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2021

2020

2021

2020

Stock-based compensation expense

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$

3,444

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$

2,837

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$

9,145

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$

5,885

Summary of changes in RSUs

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​	​	​	​	​	​
​	​	Six Months Ended June 30, 2021
​		​		Weighted-
​	​	​	​	Average
​	​	Number of	​	Grant Date
​	​	RSUs	​	Fair Value
RSUs outstanding at beginning of period		608	​	$	58.15
RSUs granted		358	​	$	95.79
RSUs vested		(173)	​	$	62.80
RSUs forfeited		(145)	​	$	66.23
RSUs outstanding at end of period		648	​	$	75.93

Summary of changes in stock options

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​	​	​	​	​	​
​	​	Six Months Ended June 30, 2021
​		​		Weighted-
​	​	​	​	Average
​	​	Number of	​	Exercise Price
​	​	Options	​	per Share
Options outstanding at beginning of period		147	​	$	23.63
Options exercised		(23)	​	$	21.42
Options expired		—	​	$	—
Options outstanding at end of period		124	​	$	24.03

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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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