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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of stock-based compensation

​

​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2021			2020			2019
Equity classified awards	​	$	15,428	​	$	12,272	​	$	7,327
Liability classified awards	​	​	311	​	​	—	​	​	—
Stock-based compensation expense	​	$	15,739	​	$	12,272	​	$	7,327

Schedule of changes in unvested RSUs

​

​	​	​	​	​	​
​	​	Year Ended December 31, 2021
​		​		Weighted-
​	​	​	​	Average
​	​	Number of	​	Grant Date
​	​	RSUs	​	Fair Value
RSUs outstanding at beginning of period		608	​	$	58.15
RSUs granted		406	​	$	94.60
RSUs vested		(178)	​	$	62.82
RSUs forfeited		(209)	​	$	70.34
RSUs outstanding at end of period		627	​	$	76.37

Summary of changes in stock options

Changes in our stock options were as follows:

​

​	​	​	​	​	​
​	​	Year Ended December 31, 2021
​		​		Weighted-
​	​	​	​	Average
​	​	Number of	​	Exercise Price
​	​	Options	​	per Share
Options outstanding at beginning of period		147	​	$	23.63
Options exercised		(35)	​	$	21.10
Options outstanding at end of period		112	​	$	24.41

Schedule of shares authorized under stock option plans, by exercise price range

The following table summarizes information about the stock options outstanding on December 31, 2021:

​

​	​	​	​	​	​	​	​
​	​	Options Outstanding and Exercisable
​	​	Number	​	Weighted-Average	​	Weighted-
​	​	Outstanding	​	Remaining	​	Average
Range of Exercise Prices		(In 000's)		Contractual Life		Exercise Price
$18.77		28		2.75 years	​	$	18.77
$26.32		84		3.10 years	​	$	26.32
$18.77 to $26.32		112		3.01 years	​	$	24.41

Employee Stock [Member]

Schedule of stock-based compensation

​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2021			2020			2019
Stock-based compensation expense related to the ESPP	​	$	1,114	​	$	856	​	$	475

​

Schedule of valuation assumptions

The fair value of each purchase right granted under the ESPP was estimated on the date of grant using the Black-Scholes-Merton option pricing model with the following assumptions:

​

​	​	​	​	​	​	​	​
​	​	Years Ended December 31,					​
​		2021		2020		2019
Risk-free interest rates		0.04% - 0.10	%	0.10% - 0.18%	%	1.62% - 2.31	%
Expected dividend yield rates		—	%	—	%	—	%
Expected term		0.5 years		0.5 years		0.5 years	​
Expected volatility		42.7	%	70.1	%	41.3	%

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