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Fair Value Measurements - Quantitative Information (Q2) (Details) $ in Thousands	Jun. 30, 2024 USD ($) $ / shares	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) $ / shares	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liability | $	$ 975	$ 1,435	$ 585	$ 2,410	$ 1,365	$ 2,090	$ 27,460
Private Placement Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liability | $	$ 350	$ 560	$ 210	$ 910	$ 490	$ 840	$ 10,710
Level 3 | Private Placement Warrants | Exercise price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input | $ / shares	11.5		11.5			11.5
Level 3 | Private Placement Warrants | Stock price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input | $ / shares	1.04		0.72			1.01
Level 3 | Private Placement Warrants | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input	0.93		0.875			0.823
Level 3 | Private Placement Warrants | Term (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, term	1 year 11 months 15 days		2 years 5 months 15 days			3 years 5 months 15 days
Level 3 | Private Placement Warrants | Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input	0.0472		0.0413			0.0417

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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