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STOCK-BASED COMPENSATION PLANS (Tables) | 9 Months Ended
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Sep. 30, 2024
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, 2024 |  | 7,091,368 | ​ | $ | 3.18
Granted |  | 1,423,228 | ​ | $ | 3.22
Vested |  | (3,444,670) | ​ | $ | 3.47
Forfeited |  | (326,985) | ​ | $ | 3.18
Unvested balance at September 30, 2024 |  | 4,742,941 | ​ | $ | 2.99
Schedule of activity related to performance based stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | Shares | ​ | Fair Value
Unvested balance at January 1, 2024 |  | 6,297,931 | ​ | $ | 2.07
Granted |  | 1,338,985 | ​ | $ | 4.32
Vested |  | (288,672) | ​ | $ | 3.14
Forfeited |  | (4,035,835) | ​ | $ | 1.33
Unvested balance at September 30, 2024 |  | 3,312,409 | ​ | $ | 3.79
Schedule of stock-based compensation expenses which are Included in condensed consolidated statement of operations | The condensed consolidated statements of operations include stock-based compensation for the three and nine months ended September 30, 2024 and 2023 as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Product cost of revenue | ​ | $ | 64 |  | $ | 121 |  | $ | 234 |  | $ | 385
Service cost of revenue |  | ​ | 291 |  | ​ | 536 |  | ​ | 1,037 |  | ​ | 1,597
Research and development |  | ​ | 745 | ​ | ​ | 1,259 | ​ | ​ | 2,429 | ​ | ​ | 3,821
Sales and marketing | ​ | ​ | 1,108 | ​ | ​ | 1,402 | ​ | ​ | 3,219 | ​ | ​ | 5,673
General and administrative | ​ | ​ | 1,837 | ​ | ​ | 1,632 | ​ | ​ | 5,142 | ​ | ​ | 5,438
​ | ​ | $ | 4,045 |  | $ | 4,950 |  | $ | 12,061 |  | $ | 16,914

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