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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 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 and nine months ended September 30, 2023 and 2022:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Cost of revenues | ​ | $ | 446 | ​ | $ | 172 | ​ | $ | 1,193 | ​ | $ | 727
Research and development | ​ |  | 2,895 | ​ |  | 2,334 | ​ |  | 7,992 | ​ |  | 7,712
Sales and marketing | ​ |  | 1,787 | ​ |  | 1,267 | ​ |  | 5,061 | ​ |  | 4,392
General and administrative | ​ |  | 1,777 | ​ |  | (755) | ​ |  | 6,779 | ​ |  | 2,879
Total stock-based compensation expense | ​ | $ | 6,905 | ​ | $ | 3,018 | ​ | $ | 21,025 | ​ | $ | 15,710
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, 2023 and activity during the nine months ended, is presented below:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | 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 |  | 130 | ​ | $ | 82.96 |  | ​ |  | ​ |
Vested |  | (34) | ​ | $ | 79.94 |  |  |  | ​ |
Forfeited |  | — | ​ | ​ | — |  |  |  | ​ |
Outstanding at September 30, 2023 |  | 130 | ​ | $ | 82.96 |  | 0.25 | ​ | $ | 9,964
Outstanding and expected to vest at September 30, 2023 |  | 39 | ​ |  | ​ | ​ | 0.25 | ​ | $ | 2,989
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, 2023 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, 2023 |  | 236 | ​ | $ | 77.82 |  | ​ |  | ​ | ​
Granted |  | 145 | ​ | $ | 80.92 |  |  |  | ​ |
Vested |  | (23) | ​ | $ | 49.68 |  |  |  | ​ |
Forfeited |  | — | ​ | ​ | — |  |  |  | ​ |
Outstanding at September 30, 2023 |  | 358 | ​ | $ | 80.89 |  | 1.37 | ​ | $ | 27,344
Outstanding and expected to vest at September 30, 2023 |  | 6 | ​ |  | ​ | ​ | 2.25 | ​ | $ | 445
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, 2023 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, 2023 |  | 1,096 | ​ | $ | 60.52 | ​ | ​ | ​ | ​ | ​
Granted |  | 333 | ​ | $ | 81.06 | ​ |  | ​ | ​ | ​
Vested |  | (386) | ​ | $ | 51.49 | ​ |  | ​ | ​ | ​
Forfeited |  | (22) | ​ | $ | 71.71 | ​ |  | ​ | ​ | ​
Outstanding at September 30, 2023 |  | 1,021 | ​ | $ | 70.39 | ​ | 1.68 | ​ | $ | 77,875
Outstanding and expected to vest at September 30, 2023 |  | 946 | ​ |  | ​ | ​ | 1.59 | ​ | $ | 72,163
​

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