FAIR VALUE MEASUREMENT (Q1)

3 Months Ended

12 Months Ended

Mar. 31, 2024

Dec. 31, 2023

NOTE 10 - FAIR VALUE MEASUREMENT

The Company uses a three-tier fair value hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:

Level 1. Quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2. Significant other inputs that are directly or indirectly observable in the marketplace.

Level 3. Significant unobservable inputs which are supported by little or no market activity.

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 estimated fair value of the conversion feature of the Derivative liability is based on traditional valuation methods including Black-Scholes option pricing models and Monte Carlo simulations.

NOTE 8 - FAIR VALUE MEASUREMENT

The Company uses a three-tier fair value hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:

Level 1. Quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2. Significant other inputs that are directly or indirectly observable in the marketplace.

Level 3. Significant unobservable inputs which are supported by little or no market activity.

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

The derivative liability is remeasured to its fair value each reporting period period and upon settlement with changes in its fair value recorded in the consolidated statement of operations. The change in fair value of the derivative liability was as follows:

Estimated fair value at December 31, 2021			$75,355.2
Change in estimated fair value			(75,809.9)
Additions from new convertible notes			15,360.0
Estimated fair value at December 31, 2022			14,905.3
Change in estimated fair value			2,791.6
Additions from new convertible notes			705.9
Estimated fair value at December 31, 2023			$18,402.8

The estimated fair value of the conversion feature of the derivative liability, a level 3 measurement was estimated using traditional valuation methods including Black-Scholes option pricing models and Monte Carlo simulations. A Black-Scholes model for Notes 1 though 8, 10, 13 and 20 and a Monte Carlo simiulation model for all other outstanding Notes as of December 31, 2023, and a Black-Scholes model for Notes 1 through 7 and a Monte Carlo simulation model for Notes 8 through 18 as of December 31, 2022. The application of the Black-Scholes model and Monte Carlo simulation requires the use of a number of inputs and significant assumptions including volatility. The following reflects the inputs and assumptions used:

	December 31, 2023	December 31, 2022
Stock price	$17.50	$15.00
Strike price	$4.00 - 10.00 and Variable	$4.00 - $10.00 and Variable
Volatility	69.70% - 82.00%	79.50% - 83.90%
Risk-free rate	5.40% - 5.55%	1.06% - 4.76%
Probability of SPAC Merger	39%	48%
Term of SPAC Merger	3 months	6 months

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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