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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