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SHAREHOLDERS' EQUITY (DEFICIT) (Q1) (Tables) | 3 Months Ended | 12 Months Ended
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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 | ​ | ​ |

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