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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Stock-Based Compensation [Abstract] |
Schedule of Options Outstanding | The following table summarizes the activity in the shares available for grant under the Plans during the three months ended March 31, 2024 and options outstanding as of March 31, 2024 (in thousands, except exercise price):
|  |  |  |  | Options Outstanding |
|  |  |  |  |  |  |  | Weighted |
|  | Shares |  |  |  |  |  | Average |
|  | Available |  |  | Number of |  |  | Exercise |
|  | for Grant |  |  | Shares |  |  | Prices |
Balance as of December 31, 2023 |  |  | 39 |  |  |  | 36 |  |  | $ | 127.00 |
RSUs granted |  |  | (2 | ) |  |  | — |  |  |  | — |
RSUs cancelled and returned to the 2019 Plan |  |  | 2 |  |  |  | — |  |  |  | — |
Options cancelled |  |  | — |  |  |  | (1 | ) |  | $ | 147.64 |
Balance as of March 31, 2024 |  |  | 39 |  |  |  | 35 |  |  | $ | 126.70 |
Schedule of RSU Activity Under Plans | A summary of RSU activity under the Plans is presented below (in thousands, except for fair value):
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  | Number of |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |
Non-vested shares as of December 31, 2023 |  |  | 15 |  |  | $ | 69.63 |
Granted |  |  | 2 |  |  | $ | 1.55 |
Cancelled |  |  | (2 | ) |  | $ | 53.54 |
Non-vested shares as of March 31, 2024 |  |  | 15 |  |  | $ | 62.04 |
Schedule of Significant Ranges of Outstanding and Exercisable Options | The following table summarizes significant ranges of outstanding and exercisable options as of March 31, 2024 (in thousands, except contractual life and exercise price):
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  | Weighted |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  | Average |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  | Remaining |  |  | Weighted |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  | Contractual |  |  | Average |  |  |  |  |  | Average |  |  | Aggregate |
|  | Number |  |  | Life |  |  | Exercise |  |  | Number |  |  | Exercise |  |  | Intrinsic |
Range of Exercise Price |  | Outstanding |  |  | (in Years) |  |  | Price |  |  | Exercisable |  |  | Price |  |  | value |
$0.00 - $62.80 |  |  | 2 |  |  |  | 5.64 |  |  | $ | 62.80 |  |  |  | 2 |  |  | $ | 62.80 |  |  | $ | — |
$62.81 - $599.60 |  |  | 33 |  |  |  | 6.49 |  |  | $ | 108.06 |  |  |  | 27 |  |  | $ | 107.66 |  |  | $ | — |
$0.00 - $599.60 |  |  | 35 |  |  |  | 6.43 |  |  | $ | 126.70 |  |  |  | 29 |  |  | $ | 130.00 |  |  | $ | — |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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