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SHAREHOLDERS' EQUITY (DEFICIT) (Q1) (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Equity [Abstract]    
Schedule of Stock Option Activity
Stock option activity for the periods presented is as follows (in thousands, except per share value):

 
 ​ ​
Options
 ​ ​
Weighted
Average
Exercise Price
Per Share
 ​ ​
Weighted
Average
Remaining
Contractual
Term (years)
 ​ ​
Aggregate
Intrinsic Value
Outstanding at December 31, 2023
 ​ ​
2,369,169
 ​ ​
$1.43
 ​ ​
8.8
 ​ ​
$6.8
Granted
 ​ ​
—
 ​ ​
$—
 ​ ​
—
 ​ ​
 
Cancelled
 ​ ​
(36,748)
 ​ ​
$3.80
 ​ ​
—
 ​ ​
 
Exercised
 ​ ​
(43,262)
 ​ ​
$0.13
 ​ ​
—
 ​ ​        
Outstanding at March 31, 2024
 ​ ​
2,289,159
 ​ ​
$1.34
 ​ ​
8.5
 ​ ​
$6.6
Exercisable as of March 31, 2024
 ​ ​
1,924,903
 ​ ​
$0.24
 ​ ​
 
 ​ ​
—
The balance and activity of all stock options outstanding under the 2021 Plan as of December 31, 2023, and 2022, is as follows:

 
 ​ ​
Options
 ​ ​
Weighted
Average
Exercise Price
Per Share
 ​ ​
Weighted
Average
Remaining
Contractual
Term (years)
Outstanding at January 1, 2022
 ​ ​
 613,463

​
$0.12
 ​ ​
9.6
Granted
 ​ ​
1,894,155
​ ​
$0.14
 ​ ​
—
Cancelled
 ​ ​
 0
​ ​
$—
 ​ ​
—
Exercised
 ​ ​
 0
​ ​
$—
 ​ ​
—
Outstanding at December 31, 2022
 ​ ​
2,507,618
​ ​
$0.14
 ​ ​
9.4
Granted
 ​ ​
 382,726
 ​ ​
$8.21
 ​ ​
—
Cancelled
 ​ ​
 (313,783)
 ​ ​
$0.22
 ​ ​
—
Exercised
 ​ ​
 (207,392)
​ ​
$0.12
 ​ ​
—
Outstanding as of December 31, 2023
 ​ ​
2,369,169
​ ​
$1.43
 ​ ​
8.8
Exercisable as of December 31, 2023
 ​ ​
2,232,117

​
$0.21
 ​ ​