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REVOLVING LOAN AND PROMISSORY NOTE - RELATED PARTY - December 2021 Secured Revolving Note (FY) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Dec. 01, 2023
Nov. 30, 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 $ 5,150 $ 1,000      
Affiliated Entity | 2023 Convertible Notes | Convertible Debt              
Line of Credit Facility [Line Items]              
Debt instrument, face amount $ 6,000            
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        
Affiliated Entity | Revolving Credit Facility | December 2021 Convertible Note              
Line of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing capacity $ 6,000            
Credit facility and other loans   0 5,150        
Accrued interest   $ 0 $ 495