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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2021

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

Stock-based Compensation Expense

The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three and nine months ended September 30, 2021 and 2020:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Three Months Ended

​

Nine Months Ended

​

​

September 30,

​

September 30,

(In thousands)

2021

2020

2021

2020

Cost of revenues

​

$

664

​

$

602

​

$

1,935

​

$

1,250

Research and development

​

3,055

​

2,976

​

8,605

​

7,436

Sales and marketing

​

2,201

​

1,900

​

5,540

​

4,550

General and administrative

​

3,725

​

3,880

​

11,245

​

8,813

Total stock-based compensation expense

​

$

9,645

​

$

9,358

​

$

27,325

​

$

22,049

Summary of Option Activity Under the Plans

A summary of stock options outstanding as of September 30, 2021, and activity during the nine months ended, is presented below:

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted-	​	​	​
​	​	​	​	Weighted-		​	Average	​	​	​
​	​	​	​	Average		​	Remaining	​	Aggregate
​	​	Shares	​	Exercise		​	Contractual Term	​	Intrinsic Value
​		(In thousands)		Price			(In years)		(In thousands)
Outstanding at January 1, 2021		92	​	$	20.63		​		​	​
Granted		—	​	​	—				​
Exercised		(80)	​	$	20.50				​
Forfeited or expired		—	​	​	—				​
Outstanding at September 30, 2021		12	​	$	21.44		0.60	​	$	931
Vested and exercisable at September 30, 2021		12	​		​	​	0.60	​	$	931

Performance Based Awards (PSUs)

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

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of PSUs outstanding as of September 30, 2021, and activity during the nine months ended, is presented below:

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted-	​	​	​
​	​	​	​	Weighted-		​	Average	​	​	​
​	​	​	​	Average		​	Remaining	​	Aggregate
​	​	Shares	​	Grant Date Fair		​	Contractual Term	​	Intrinsic Value
​		(In thousands)		Value Per Share			(In years)		(In thousands)
Outstanding at January 1, 2021		150	​	$	46.27		​		​	​
Granted		105	​	$	84.40				​
Vested		(150)	​	$	46.27				​
Forfeited		(1)	​	$	85.01				​
Outstanding at September 30, 2021		104	​	$	84.39		0.25	​	$	10,342
Outstanding and expected to vest at September 30, 2021		104	​		​	​	0.25	​	$	10,342

Long-Term Performance-Based Awards (PRSUs)

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

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of PRSUs outstanding as of September 30, 2021, and activity during the nine months ended, is presented below:

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted-Average	​	Aggregate
​	​	​	​	Weighted-Average		​	Remaining	​	Intrinsic
​	​	Shares	​	Grant Date Fair		​	Contractual Term	​	Value
​		(In thousands)		Value Per Share			(In years)		(In thousands)
Outstanding at January 1, 2021		301	​	$	41.90		​		​	​
Granted		103	​	$	82.92				​
Vested		(6)	​	$	29.95				​
Forfeited		(15)	​	$	40.05				​
Outstanding at September 30, 2021		383	​	$	53.14		1.17	​	$	37,871
Outstanding and expected to vest at September 30, 2021		383	​		​	​	1.17	​	$	37,871

Restricted Stock Units (RSUs)

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

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of RSUs outstanding as of September 30, 2021, and activity during the nine months ended, is presented below:

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted-Average	​	Aggregate
​	​	​	​	Weighted-Average		​	Remaining	​	Intrinsic
​	​	Shares	​	Grant Date Fair		​	Contractual Term	​	Value
​		(In thousands)		Value Per Share			(In years)		(In thousands)
Outstanding at January 1, 2021		1,518	​	$	35.51		​		​	​
Granted		262	​	$	83.27				​
Vested		(538)	​	$	34.89				​
Forfeited		(84)	​	$	38.38				​
Outstanding at September 30, 2021		1,158	​	$	46.42		1.48	​	$	114,544
Outstanding and expected to vest at September 30, 2021		1,081	​		​	​	1.43	​	$	107,057

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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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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