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STOCK-BASED COMPENSATION PLANS (Tables) | 9 Months Ended
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Sep. 30, 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 |  | 8,304,705 | ​ | $ | 3.67
Vested |  | (2,922,214) | ​ | $ | 3.09
Forfeited |  | (205,197) | ​ | $ | 3.49
Unvested balance at September 30, 2025 |  | 9,174,402 | ​ | $ | 3.58
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 |  | 2,118,290 | ​ | $ | 4.02
Vested |  | (423,677) | ​ | $ | 3.52
Forfeited |  | (461,794) | ​ | $ | 3.53
Unvested balance at September 30, 2025 |  | 4,838,711 | ​ | $ | 3.91
Schedule of stock-based compensation expenses which are Included in consolidated statement of operations | The condensed consolidated statements of operations include stock-based compensation for the three and nine months ended September 30, 2025 and 2024 as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended | ​
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
Product cost of revenue | ​ | $ | 17 |  | $ | 64 |  | $ | 116 |  | $ | 234 | ​
Service cost of revenue |  | ​ | 152 |  | ​ | 291 |  | ​ | 636 |  | ​ | 1,037 |
Research and development |  | ​ | 398 | ​ | ​ | 745 | ​ | ​ | 1,578 | ​ | ​ | 2,429 |
Sales and marketing | ​ | ​ | 1,493 | ​ | ​ | 1,108 | ​ | ​ | 3,732 | ​ | ​ | 3,219 | ​
General and administrative | ​ | ​ | 3,784 | ​ | ​ | 1,837 | ​ | ​ | 8,557 | ​ | ​ | 5,142 | ​
​ | ​ | $ | 5,844 |  | $ | 4,045 |  | $ | 14,619 |  | $ | 12,061 | ​

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