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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | 6. Stock-Based Compensation The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards, whether they possess time-based vesting provisions or performance-based vesting provisions, and awards granted under the Vicor Corporation 2017 Employee Stock Purchase Plan (“ESPP”), as of their grant date. Stock-based compensation expense was as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Cost of revenues |  | $ | 744 |  |  | $ | 570 |  |  | $ | 1,498 |  |  | $ | 1,056 |
Selling, general and administrative |  |  | 1,757 |  |  |  | 1,626 |  |  |  | 3,676 |  |  |  | 3,146 |
Research and development |  |  | 930 |  |  |  | 816 |  |  |  | 2,037 |  |  |  | 1,627 |
Total stock-based compensation |  | $ | 3,431 |  |  | $ | 3,012 |  |  | $ | 7,211 |  |  | $ | 5,829 |
Compensation expense by type of award was as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Stock options |  | $ | 3,167 |  |  | $ | 2,701 |  |  | $ | 6,633 |  |  | $ | 5,197 |
ESPP |  |  | 264 |  |  |  | 311 |  |  |  | 578 |  |  |  | 632 |
Total stock-based compensation |  | $ | 3,431 |  |  | $ | 3,012 |  |  | $ | 7,211 |  |  | $ | 5,829 |

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