Amount of current federal, state, and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current national, regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction.

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Income Taxes, Components of Income Tax Expense (FY) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Current [Abstract]
United States and state					$ 0	$ 0
Foreign, net					(9)	(9)
Deferred [Abstract]
United States and state					0	0
Foreign					0	0
Total income tax expense	$ (2)	$ (2)	$ (6)	$ (6)	$ (9)	$ (9)