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REVOLVING LOAN AND PROMISSORY NOTE - RELATED PARTY - Narrative (Q1) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 01, 2023
Nov. 30, 2023
Mar. 15, 2023
Dec. 09, 2021
2023 Convertible Notes | Convertible Debt                
Line of Credit Facility [Line Items]                
Interest rate       4.00%        
Interest expense, debt     $ 34 $ 0        
Debt instrument, face amount     18,420   $ 18,420 $ 18,400    
Accrued interest         $ 34 $ 100    
Affiliated Entity                
Line of Credit Facility [Line Items]                
Credit facility and other loans $ 1,000   $ 1,000 5,150        
Affiliated Entity | 2023 Convertible Notes | Convertible Debt                
Line of Credit Facility [Line Items]                
Debt instrument, face amount   $ 6,000            
Affiliated Entity | March 2023 Promissory Note | Promissory Note                
Line of Credit Facility [Line Items]                
Interest rate 10.00%   10.00%       10.00%  
Default interest rate             0.20  
Interest expense, debt $ 23 109 $ 86          
Debt instrument, face amount     1,000       $ 1,000  
Credit facility and other loans 1,000   1,000 $ 0        
Accrued interest $ 109   $ 86          
Affiliated Entity | Revolving Credit Facility | December 2021 Note                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 8,000
Interest rate     9.00% 4.00%       4.00%
Default interest rate, over regular interest rate               0.0500
Default interest rate               0.09
Default description, judgement amount               $ 500
Interest penalty for missed payments               0.05
Interest expense, debt   $ 370 $ 370 $ 480