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Fair Value Measurement - Classification by level of input within the fair value hierarchy (Details) - Recurring basis - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Liabilities    
Derivative liability - Class A Common Stock warrants $ 179 $ 271
Warrant liability - Series m-3 Preferred Stock    
Liabilities    
Warrant liability 212 284
Warrant liability - Series s Preferred Stock    
Liabilities    
Warrant liability 5,086 5,692
Money market funds    
Assets    
Money market funds 1,107 1,104
Level 1 | Money market funds    
Assets    
Money market funds 1,107 1,104
Level 3    
Liabilities    
Derivative liability - Class A Common Stock warrants 179 271
Level 3 | Warrant liability - Series m-3 Preferred Stock    
Liabilities    
Warrant liability 212 284
Level 3 | Warrant liability - Series s Preferred Stock    
Liabilities    
Warrant liability $ 5,086 $ 5,692