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Fair Value Measurement - Classification by level of input within the fair value hierarchy (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Liabilities    
Derivative liability - Class A Common Stock warrants $ 271 $ 1,146
2022 Convertible Notes   8,152
Warrant liability - Series m-3 Preferred Stock    
Liabilities    
Warrant liability 284 1,282
Warrant liability - Series s Preferred Stock    
Liabilities    
Warrant liability 5,692 8,729
Money market funds    
Assets    
Money market funds 1,104 3,025
Level 1 | Money market funds    
Assets    
Money market funds 1,104 3,025
Level 3    
Liabilities    
Derivative liability - Class A Common Stock warrants 271 1,146
2022 Convertible Notes   8,152
Level 3 | Warrant liability - Series m-3 Preferred Stock    
Liabilities    
Warrant liability 284 1,282
Level 3 | Warrant liability - Series s Preferred Stock    
Liabilities    
Warrant liability $ 5,692 $ 8,729