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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
--- | ---
Mar. 31, 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 months ended March 31, 2024 and 2023:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) |  | 2024 |  | 2023
Cost of revenues | ​ | $ | 346 | ​ | $ | 301
Research and development | ​ |  | 2,425 | ​ |  | 2,668
Sales and marketing | ​ |  | 1,604 | ​ |  | 1,653
General and administrative | ​ |  | 2,039 | ​ |  | 2,746
Total stock-based compensation expense | ​ | $ | 6,414 | ​ | $ | 7,368
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 |  | 1 | ​ | $ | 74.25 |  | ​ |  | ​ |
Vested |  | (38) | ​ | $ | 82.94 |  |  |  | ​ |
Forfeited |  | — | ​ | ​ | — |  |  |  | ​ |
Outstanding at March 31, 2024 |  | 1 | ​ | $ | 74.79 |  | 0.75 | ​ | $ | 60
Outstanding and expected to vest at March 31, 2024 |  | 1 | ​ |  | ​ | ​ | 0.75 | ​ | $ | 43
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 |  | — | ​ | ​ | — |  |  |  | ​ |
Vested |  | — | ​ | ​ | — |  |  |  | ​ |
Forfeited |  | — | ​ | ​ | — |  |  |  | ​ |
Outstanding at March 31, 2024 |  | 256 | ​ | $ | 80.08 |  | 1.32 | ​ | $ | 18,288
Outstanding and expected to vest at March 31, 2024 |  | — | ​ | ​ | ​ | ​ | — | ​ | ​ | —
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 |  | 7 | ​ | $ | 71.28 | ​ |  | ​ | ​ | ​
Vested |  | (148) | ​ | $ | 73.09 | ​ |  | ​ | ​ | ​
Forfeited |  | (4) | ​ | $ | 80.80 | ​ |  | ​ | ​ | ​
Outstanding at March 31, 2024 |  | 836 | ​ | $ | 69.72 | ​ | 1.85 | ​ | $ | 59,803
Outstanding and expected to vest at March 31, 2024 |  | 781 | ​ |  | ​ | ​ | 1.40 | ​ | $ | 55,916
​

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