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Summary of Significant Accounting Policies - Segments and geographical information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) segment | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($)
Revenue based upon the customers country of origin |  |  |  |
Number of operating segments | segment | 1 |  | 1 |
Total revenue, net | $ 2,275 | $ 980 | $ 5,430 | $ 7,268
United States |  |  |  |
Revenue based upon the customers country of origin |  |  |  |
Total revenue, net | $ 1,962 | 916 | $ 4,361 | 5,813
Percentage of assets | 100.00% |  | 100.00% |
International |  |  |  |
Revenue based upon the customers country of origin |  |  |  |
Total revenue, net | $ 313 | $ 64 | $ 1,069 | $ 1,455

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