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Debt - Maturities of convertible notes (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Maturities of convertible notes    
December 31, 2024 $ 0  
December 31, 2025 5,000  
Total $ 50,470 $ 79,856
Convertible debt    
Maturities of convertible notes    
December 31, 2024   27,794
December 31, 2025   3,614
December 31, 2026   2,625
Total   $ 34,033