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FAIR VALUE MEASUREMENT (Q1) (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
FAIR VALUE MEASUREMENT [Abstract]    
Fair Value Measurement

The derivative liability component of Convertible promissory notes are classified as Level 3 due to significant unobservable inputs.

 
 ​ ​
As of March 31, 2024
(in thousands)
​ ​
Quoted prices in
active markets for
identical assets
(Level 1)
 ​ ​
Significant
other observable
inputs
(Level 2)
 ​ ​
Significant
unobservable
inputs
(Level 3)
Current Liabilites
​ ​
 
 ​ ​
 
 ​ ​
 
Derivative liability
 ​ ​
​ ​
​ ​
—
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Liabilities
​ ​
 
 ​ ​
 
 ​ ​
 
Derivative liability
 ​ ​
​ ​
​ ​
—

 
 ​ ​
As of December 31, 2023
(in thousands)
 ​ ​
Quoted prices in
active markets for
identical assets
(Level 1)
 ​ ​
Significant
other observable
inputs
(Level 2)
 ​ ​
Significant
unobservable
inputs
(Level 3)
Current Liabilites
​ ​
 
 ​ ​
 
 ​ ​
 
Derivative liability
 ​ ​
​ ​
​ ​
17,282.5
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Liabilities
​ ​
 
 ​ ​
 
 ​ ​
 
Derivative liability
 ​ ​
​ ​
​ ​
1,120.3

The derivative liability is classified as Level 3 due to significant unobservable inputs.

 
 ​ ​
As of December 31, 2023
(in thousands)
​ ​
Quoted prices
in active
markets for
identical assets
(Level 1)
 ​ ​
Significant
other
observable
inputs
(Level 2)
 ​ ​
Significant
unobservable
inputs
(Level 3)
Current Liabilites
​ ​
 
 ​ ​
 
 ​ ​
 
Derivative liability
 ​ ​
 
 ​ ​
 
 ​ ​
17,282.5
Liabilities
​ ​
 
 ​ ​
 
 ​ ​
 
Derivative liability
 ​ ​
 
 ​ ​
 
 ​ ​
1,120.3

 
 ​ ​
As of December 31, 2022
(in thousands)
​ ​
Quoted prices
in active
markets for
identical assets
(Level 1)
 ​ ​
Significant
other
observable
inputs
(Level 2)
 ​ ​
Significant
unobservable
inputs
(Level 3)
Liabilities
​ ​
 
 ​ ​
 
 ​ ​
 
Derivative liability
 ​ ​
 
 ​ ​
 
 ​ ​
14,905.3