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STOCK-BASED COMPENSATION PLANS (Tables) | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Schedule of Activity Related to Outstanding Stock Options | The activity related to the Company's outstanding stock options for the three months ended March 31, 2022 was as follows:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2022 | 184,169 |  |  | $ | 13.25 |  |  |  |  |
Exercised | (355) |  |  | $ | 1.95 |  |  |  |  |
Expired | (3,470) |  |  | $ | 15.62 |  |  |  |  |
Outstanding at March 31, 2022 | 180,344 |  |  | $ | 13.23 |  |  | 2.35 |  | $ | 50 |
Vested or expected to vest at March 31, 2022 | 180,344 |  |  | $ | 13.23 |  |  | 2.35 |  | $ | 50 |
Exercisable at March 31, 2022 | 180,344 |  |  | $ | 13.23 |  |  | 2.35 |  | $ | 50 |
Schedule of Activity Related to Unvested Restricted Stock Grants | The activity related to the Company's RSUs for the three months ended March 31, 2022 was as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2022 | 5,389,611 |  |  | $ | 6.19 |
Granted | 71,077 |  |  | $ | 4.05 |
Vested | (1,610,990) |  |  | $ | 6.40 |
Forfeited | (138,550) |  |  | $ | 6.44 |
Unvested balance at March 31, 2022 | 3,711,148 |  |  | $ | 6.05 |
Schedule of Activity Related to Performance Stock Awards | The activity related to the Company's PSUs for the three months ended March 31, 2022 was as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2022 | 4,987,876 |  |  | $ | 2.87 |
Granted | 18,225 |  |  | $ | 2.65 |
Vested | (175,751) |  |  | $ | 5.03 |
Forfeited | (283,258) |  |  | $ | 7.95 |
Unvested balance at March 31, 2022 | 4,547,092 |  |  | $ | 2.31 |
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 months ended March 31, 2022 and 2021 as follows (in thousands):
|  |  | Three months ended
|  |  |  |  | March 31, 2022 |  | March 31, 2021
Product cost of revenue |  |  |  |  | $ | 99 |  |  | $ | 27 |
Service cost of revenue |  |  |  |  | 481 |  |  | 235 |
Research and development |  |  |  |  | 1,206 |  |  | 627 |
Sales and marketing |  |  |  |  | 1,371 |  |  | 1,874 |
General and administrative |  |  |  |  | 1,098 |  |  | 2,297 |
|  |  |  |  | $ | 4,255 |  |  | $ | 5,060 |

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