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SHAREHOLDERS EQUITY (DEFICIT) - Schedule of Exercise Price Range, Options (FY) (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Options Outstanding, Shares (in shares) 2,289,159 2,369,169 2,507,618 613,463 2,478,020
Options Outstanding, Life (in years) 8 years 6 months 8 years 9 months 18 days 9 years 4 months 24 days 9 years 7 months 6 days  
Options Exercisable (in shares) 1,924,903 2,232,117      
Exercise Price $0.12          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Exercise Price (USD per share)   $ 0.12      
Options Outstanding, Shares (in shares)   160,856      
Options Outstanding, Life (in years)   7 years 7 months 6 days      
Exercise Price $0.14          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Exercise Price (USD per share)   $ 0.14      
Options Outstanding, Shares (in shares)   1,594,962      
Options Outstanding, Life (in years)   8 years 9 months 18 days      
Exercise Price $0.16          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Exercise Price (USD per share)   $ 0.16      
Options Outstanding, Shares (in shares)   235,042      
Options Outstanding, Life (in years)   8 years 6 months      
Exercise Price $7.21          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Exercise Price (USD per share)   $ 7.21      
Options Outstanding, Shares (in shares)   76,453      
Options Outstanding, Life (in years)   9 years 3 months 18 days      
Exercise Price $8.40          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Exercise Price (USD per share)   $ 8.4      
Options Outstanding, Shares (in shares)   101,778      
Options Outstanding, Life (in years)   9 years 10 months 24 days      
Exercise Price $8.52          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Exercise Price (USD per share)   $ 8.52      
Options Outstanding, Shares (in shares)   200,078      
Options Outstanding, Life (in years)   9 years 10 months 24 days