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Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 19, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | May 31, 2021 | Dec. 31, 2020 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 09, 2020
Share-Based Compensation |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  | 1,886,166 | 1,886,166 |  |  |
2020 Equity Incentive Plan | Stock option |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  | 26,500
Additional number of shares authorized |  |  | 40,000 | 40,000 | 43,257 |  |  |  | 40,000 |
Number of share options granted |  | 149,757 |  |  |  |  |  | 149,757 |  |
Expiration term |  |  |  |  |  | 10 years | 10 years |  |  |
Number of options granted |  | 149,757 |  |  |  |  | 2,050 | 30,956 |  |
Fair value of options granted (in dollars per share) |  |  |  |  |  |  | $ 33.50 | $ 30.91 |  |
Options exercised |  |  |  |  |  |  | 110,916 | 0 |  |
Share-based compensation expense recognized in selling, general and administrative expenses | $ 845 |  |  |  |  |  | $ 1,197 | $ 644 |  |
Unrecognized compensation cost related to unvested stock options granted |  | $ 1,129 |  |  |  |  | 0 | 1,129 |  |
Fair value of shares vested |  |  |  |  |  |  | $ 1,197 | $ 841 |  |
2020 Equity Incentive Plan | Stock option | Minimum |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |
Service period for options vest and become fully exercisable |  |  |  |  |  | 2 years | 2 years |  |  |
2020 Equity Incentive Plan | Stock option | Maximum |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |
Service period for options vest and become fully exercisable |  |  |  |  |  | 4 years | 4 years |  |  |

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