Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Topic 606
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+ Details

Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue (FY) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Service revenue	$ 107	$ 339	$ 1,829	$ 2,066	$ 3,089	$ 299
Transportation services
Disaggregation of Revenue [Line Items]
Service revenue	0	0	0	1,305	1,582	127
Hosted payload services
Disaggregation of Revenue [Line Items]
Service revenue	0	284	0	426	568	0
Forfeited customer deposits
Disaggregation of Revenue [Line Items]
Service revenue	0	55	35	335	641	172
Engineering project services
Disaggregation of Revenue [Line Items]
Service revenue	$ 107	$ 0	$ 1,794	$ 0	$ 298	$ 0