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Debt - Convertible Promissory Notes (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
item
$ / shares
shares
Dec. 31, 2022
USD ($)
shares
Feb. 29, 2024
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
Borrowings        
Amount of debt converted   $ 32,500    
Number of shares issued on conversion of debt | shares   10,026,354    
Conversion price | $ / shares       $ 3.50
Amount outstanding $ 50,470     $ 79,856
Minimum        
Borrowings        
Conversion price | $ / shares       $ 3.50
Historical convertible promissory notes        
Borrowings        
Amount of debt converted $ 32,100      
Number of shares issued on conversion of debt | shares 4,258,223      
Amount of principal and interest outstanding $ 7,900      
Number of noteholders | item 2      
Conversion price | $ / shares $ 3.50      
Amount outstanding $ 5,630     $ 35,347
Historical convertible promissory notes | Minimum        
Borrowings        
Interest rate (as a percent) 4.00%      
Historical convertible promissory notes | Maximum        
Borrowings        
Interest rate (as a percent) 7.00%      
2023 & 2024 convertible promissory notes        
Borrowings        
Amount outstanding $ 5,000      
2023 & 2024 convertible promissory notes | CVT Investors        
Borrowings        
Principal amount $ 13,300      
Interest rate (as a percent) 5.00%      
Amount of debt converted $ 13,400      
Number of shares issued on conversion of debt | shares 2,004,535      
Conversion price | $ / shares $ 6.67      
Amount outstanding $ 0      
2023 & 2024 convertible promissory notes | Strategic investor        
Borrowings        
Principal amount $ 5,000   $ 5,000  
Interest rate (as a percent) 5.00%      
Term for conversion 6 months      
Conversion price | $ / shares $ 10.00