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Segments and Information | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Segments and Information |  |
Segments and Information | 15.Segments and Information The Company operates in one segment. Revenue information by geographic region is presented in Note 4 to these condensed consolidated financial statements. Long-lived assets by geographic region were as follows as of (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2024 |  | December 31, 2023
South Korea | ​ | $ | 1,170 | ​ | $ | 1,363
United States | ​ |  | 817 | ​ |  | 930
Total long-lived assets | ​ | $ | 1,987 | ​ | $ | 2,293
​ | 13.Segments and Geographical Information The Company operates in one segment. Revenue information by geographic region is presented in Note 1 to these consolidated financial statements. Long-lived assets by geographic region for the years ended December 31, 2023 and 2022 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022
United States | ​ | $ | 930 | ​ | $ | 1,295
South Korea | ​ |  | 1,363 | ​ |  | 626
Total long-lived assets | ​ | $ | 2,293 | ​ | $ | 1,921
​

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