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Fair Value of Measurements - Changes in the fair value (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 24 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Fair Value of Measurements          
Change in fair value of convertible promissory notes, Extensible list Other income (expense), net Other income (expense), net     Interest to pay dissolution expenses
Convertible Debt [Member]          
Fair Value of Measurements          
Fair value as of beginning of period $ 34,033 $ 31,166 $ 31,166 $ 56,996 $ 56,996
Change in fair value of convertible promissory notes 1,203 (549) 1,428 450  
Conversion of convertible promissory notes     (61) (33,140)  
Repayment of convertible promissory notes     (500) (1,140)  
Transfer of convertible promissory notes to bank borrowings       (1,000)  
Borrowing of convertible promissory notes 16,290   2,000 9,000  
Fair value as of end of period $ 10,317 $ 30,617 $ 34,033 $ 31,166 $ 34,033