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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
STOCK-BASED COMPENSATION PLANS |
Schedule of activity related to unvested restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | ​ | ​ ​ ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | Shares | ​ | Fair Value
Unvested balance at January 1, 2025 |  | 3,997,108 | ​ | $ | 3.04
Granted |  | 9,489,433 | ​ | $ | 3.13
Vested |  | (3,334,571) | ​ | $ | 3.08
Forfeited |  | (223,714) | ​ | $ | 2.80
Unvested balance at December 31, 2025 |  | 9,928,256 | ​ | $ | 3.12
Schedule of activity related to performance based stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | ​ | ​ ​ ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | Shares | ​ | Fair Value
Unvested balance at January 1, 2025 |  | 3,605,892 | ​ | $ | 3.75
Granted |  | 2,334,302 | ​ | $ | 4.04
Vested |  | (423,677) | ​ | $ | 3.52
Forfeited |  | (461,794) | ​ | $ | 3.53
Unvested balance at December 31, 2025 |  | 5,054,723 | ​ | $ | 3.93
Schedule of stock-based compensation expenses which are Included in consolidated statement of operations | The consolidated statements of operations included stock-based compensation for the years ended December 31, 2025, 2024 and 2023 as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ | ​ ​ ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023
Product cost of revenue | ​ | $ | 159 |  | $ | 300 |  | $ | 510
Service cost of revenue |  | ​ | 801 |  | ​ | 1,325 |  | ​ | 2,147
Research and development |  | ​ | 2,014 | ​ | ​ | 3,166 | ​ | ​ | 4,933
Sales and marketing | ​ | ​ | 4,647 | ​ | ​ | 4,397 | ​ | ​ | 7,111
General and administrative | ​ | ​ | 11,785 | ​ | ​ | 6,898 | ​ | ​ | 7,105
​ | ​ | $ | 19,406 |  | $ | 16,086 |  | $ | 21,806

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