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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2024
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 six months ended June 30, 2024 and 2023:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(In thousands) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Cost of revenues | ​ | $ | 707 | ​ | $ | 446 | ​ | $ | 1,053 | ​ | $ | 747
Research and development | ​ |  | 3,885 | ​ |  | 2,429 | ​ |  | 6,310 | ​ |  | 5,097
Sales and marketing | ​ |  | 2,510 | ​ |  | 1,621 | ​ |  | 4,114 | ​ |  | 3,274
General and administrative | ​ |  | 3,933 | ​ |  | 2,256 | ​ |  | 5,972 | ​ |  | 5,002
Total stock-based compensation expense | ​ | $ | 11,035 | ​ | $ | 6,752 | ​ | $ | 17,449 | ​ | $ | 14,120
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, 2024 |  | 38 | ​ | $ | 82.95 |  | ​ |  | ​ | ​
Granted |  | 183 | ​ | $ | 70.11 |  | ​ |  | ​ |
Vested |  | (38) | ​ | $ | 82.94 |  |  |  | ​ |
Forfeited |  | (1) | ​ | $ | 71.71 |  |  |  | ​ |
Outstanding at June 30, 2024 |  | 182 | ​ | $ | 70.10 |  | 0.50 | ​ | $ | 12,787
Outstanding and expected to vest at June 30, 2024 |  | 149 | ​ |  | ​ | ​ | 0.50 | ​ | $ | 10,482
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, 2024 |  | 256 | ​ | $ | 80.08 |  | ​ |  | ​ | ​
Granted |  | 182 | ​ | $ | 68.52 |  |  |  | ​ |
Vested |  | — | ​ | ​ | — |  |  |  | ​ |
Forfeited |  | — | ​ | ​ | — |  |  |  | ​ |
Outstanding at June 30, 2024 |  | 438 | ​ | $ | 75.27 |  | 1.67 | ​ | $ | 30,721
Outstanding and expected to vest at June 30, 2024 |  | 182 | ​ | ​ | ​ | ​ | 2.50 | ​ | $ | 12,780
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, 2024 |  | 981 | ​ | $ | 70.27 | ​ | ​ | ​ | ​ | ​
Granted |  | 389 | ​ | $ | 67.65 | ​ |  | ​ | ​ | ​
Vested |  | (330) | ​ | $ | 63.19 | ​ |  | ​ | ​ | ​
Forfeited |  | (13) | ​ | $ | 75.96 | ​ |  | ​ | ​ | ​
Outstanding at June 30, 2024 |  | 1,027 | ​ | $ | 71.48 | ​ | 1.84 | ​ | $ | 72,075
Outstanding and expected to vest at June 30, 2024 |  | 944 | ​ |  | ​ | ​ | 1.77 | ​ | $ | 66,274

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