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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accrued Liabilities, Current [Abstract]      
Accrued legal   $ 0 $ 2,198
Accrued professional fees $ 315 275 460
Accrued GEM facility commitment 4,000 4,000 0
Accrued contingency fee 187 199 0
Accrued wages and benefits 1,534 1,298 250
Other accrued expenses and other current liabilities 478 515 267
Total accrued expenses and other current liabilities $ 6,514 $ 6,287 $ 3,175