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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Stock-based Compensation Expense | The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three months ended March 31, 2023 and 2022:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) |  | 2023 |  | 2022
Cost of revenues | ​ | $ | 301 | ​ | $ | 320
Research and development | ​ |  | 2,668 | ​ |  | 3,055
Sales and marketing | ​ |  | 1,653 | ​ |  | 1,948
General and administrative | ​ |  | 2,746 | ​ |  | 3,690
Total stock-based compensation expense | ​ | $ | 7,368 | ​ | $ | 9,013
​
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted-Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average | ​ | Remaining | ​ | Aggregate
​ | ​ | Shares | ​ | Grant Date Fair | ​ | Contractual Term | ​ | Intrinsic Value
​ |  | (In thousands) |  | Value Per Share |  | (In years) |  | (In thousands)
Outstanding at January 1, 2023 |  | 34 | ​ | $ | 79.94 |  | ​ |  | ​ | ​
Granted |  | 75 | ​ | $ | 82.49 |  | ​ |  | ​ |
Vested |  | (34) | ​ | $ | 79.94 |  |  |  | ​ |
Forfeited |  | — | ​ | ​ | — |  |  |  | ​ |
Outstanding at March 31, 2023 |  | 75 | ​ | $ | 82.49 |  | 0.75 | ​ | $ | 6,312
Outstanding and expected to vest at March 31, 2023 |  | 40 | ​ |  | ​ | ​ | 0.75 | ​ | $ | 3,358
​
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | 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, 2023 |  | 236 | ​ | $ | 77.82 |  | ​ |  | ​ | ​
Granted |  | 145 | ​ | $ | 80.92 |  |  |  | ​ |
Vested |  | (23) | ​ | $ | 49.68 |  |  |  | ​ |
Forfeited |  | — | ​ | ​ | — |  |  |  | ​ |
Outstanding at March 31, 2023 |  | 358 | ​ | $ | 80.89 |  | 1.87 | ​ | $ | 30,329
Outstanding and expected to vest at March 31, 2023 |  | 143 | ​ |  | ​ | ​ | 2.75 | ​ | $ | 12,094
​
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | 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, 2023 |  | 1,096 | ​ | $ | 60.52 |  | ​ |  | ​ | ​
Granted |  | 148 | ​ | $ | 80.07 |  |  |  | ​ |
Vested |  | (166) | ​ | $ | 59.06 |  |  |  | ​ |
Forfeited |  | (4) | ​ | $ | 68.73 |  |  |  | ​ |
Outstanding at March 31, 2023 |  | 1,074 | ​ | $ | 63.41 |  | 2.03 | ​ | $ | 90,903
Outstanding and expected to vest at March 31, 2023 |  | 995 | ​ |  | ​ | ​ | 1.59 | ​ | $ | 84,247

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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