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PROPERTY, PLANT AND EQUIPMENT (FY) (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
PROPERTY, PLANT AND EQUIPMENT [Abstract]    
Property, Plant and Equipment

Property and equipment consist of the following:

(in thousands)
 ​ ​
March 31, 2024
 ​ ​
December 31, 2023
Property and equipment
​ ​
 
 ​ ​
 
Furniture and equipment
 ​ ​
$34.5
 ​ ​
$34.5
Computer equipment
 ​ ​
120.8
 ​ ​
120.8
Accumulated depreciation
 ​ ​
(131.7)
 ​ ​
(126.1)
Property and equipment, net
 ​ ​
$23.7
 ​ ​
$29.2

Property and equipment consist of the following:
(in thousands)
 ​ ​
December 31, 2023
 ​ ​
December 31, 2022
Property and equipment
​ ​
 
 ​ ​
 
Furniture and equipment
 ​ ​
$34.5
 ​ ​
$34.5
Computer equipment
 ​ ​
120.8
 ​ ​
118.6
Accumulated depreciation
 ​ ​
(126.1)
 ​ ​
(65.7)
Property and equipment, net
 ​ ​
$29.2
 ​ ​
$87.4