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Stock Option Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Stock Option Activity Under Stock Option Plan | Stock option activity under the Company's stock options plans for the years ending December 31, 2023 and 2022 were as follows:
(in thousands, except share and per share data) |  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding, December 31, 2021 |  |  | 711,058 |  |  | $ | 43.05 |  |  |  |  |  |  |
Granted |  |  | 313,167 |  |  |  | 16.14 |  |  |  |  |  |  |
Exercised |  |  | (1,750 | ) |  |  | 12.00 |  |  |  |  |  |  |
Cancelled |  |  | (328,566 | ) |  |  | 50.10 |  |  |  |  |  |  |
Outstanding, December 31, 2022 |  |  | 693,909 |  |  | $ | 27.60 |  |  |  |  |  |  |
Granted |  |  | 259,122 |  |  |  | 7.35 |  |  |  |  |  |  |
Cancelled |  |  | (487,133 | ) |  |  | 17.70 |  |  |  |  |  |  |
Outstanding, December 31, 2023 |  |  | 465,898 |  |  | $ | 26.85 |  |  |  | 7.81 |  |  | $ | — |
Options exercisable, December 31, 2023 |  |  | 415,376 |  |  | $ | 28.80 |  |  |  | 7.64 |  |  | $ | — |
Options available for future grant, December 31, 2023 |  |  | 1,302,411 |  |  |  |  |  |  |  |  |  |
Summary of Non-Vested Restricted Stock | A summary of the status of restricted stock as of December 31, 2023 and 2022 is as follows:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |
Unvested, December 31, 2021 |  |  | 79,905 |  |  | $ | 31.54 |
Granted |  |  | 18,667 |  |  |  | 12.30 |
Vested |  |  | (20,441 | ) |  |  | 34.21 |
Cancelled |  |  | (15,527 | ) |  |  | 47.23 |
Unvested, December 31, 2022 |  |  | 62,604 |  |  | $ | 21.04 |
Vested |  |  | (33,322 | ) |  |  | 17.94 |
Cancelled |  |  | (29,282 | ) |  |  | 24.60 |
Unvested, December 31, 2023 |  |  | — |  |  | $ | — |

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