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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of stock-based compensation

​

​	​	​	​	​	​	​
​	​	Three Months Ended March 31,
​		2021			2020
Stock-based compensation expense	​	$	5,701	​	$	3,048

Summary of stock option activity

​

​	​	​	​	​	​
​	​	Three Months Ended March 31, 2021
​		​		Weighted-
​	​	​	​	Average
​	​	Number of	​	Grant Date
​	​	RSUs	​	Fair Value
RSUs outstanding at beginning of period		608	​	$	58.15
RSUs granted		227	​	$	93.93
RSUs vested		(125)	​	$	58.18
RSUs forfeited		(110)	​	$	65.70
RSUs outstanding at end of period		600	​	$	70.37

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of stock option activity

​

​	​	​	​	​	​
​	​	Three Months Ended March 31, 2021
​		​		Weighted-
​	​	​	​	Average
​	​	Number of	​	Exercise Price
​	​	Options	​	per Share
Options outstanding at beginning of period		147	​	$	23.63
Options exercised		(13)	​	$	20.52
Options expired		—	​	$	​
Options outstanding at end of period		134	​	$	23.92

X

- Definition

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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- Definition

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.

+ References

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