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Promissory Notes Payable (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 18, 2024	May 31, 2024	Aug. 31, 2020	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jun. 30, 2024	Jan. 31, 2024	Dec. 31, 2023	May 31, 2023	Nov. 30, 2022	Aug. 31, 2022
Debt Conversion [Line Items]
Outstanding principal, amount converted	$ 8,900	$ 1,200
Interest converted		$ 200
Shares issued for settlement of debt and warrants (in shares)		94,130
Gain on conversion of the Notes	$ 300
Gain on extinguishment of debt				$ (477)	$ 0	$ (477)	$ 5,205
Reduction in accrued interest						0	(2,749)
Notes Payable, Other Payables \| Celularity's UltraMIST Assets
Debt Conversion [Line Items]
Interest rate (as a percent)			12.00%
Aggregate consideration paid for the assets			$ 24,000
Issuance of promissory notes			$ 4,000
Accrued interest rate (as a percent)			5.00%
Accrued interest								$ 0
Repayments of debt								2,200
Convertible Promissory Notes Payable, Related Parties
Debt Conversion [Line Items]
Secured term loan			$ 1,400
Accrued interest								0
Repayments of convertible debt								1,400
Gain on extinguishment of debt								800
Reduction in accrued interest								$ 800
Related Party
Debt Conversion [Line Items]
Interest expense				0	346	0	1,056
Related Party \| Notes Payable, Other Payables
Debt Conversion [Line Items]
Secured term loan									$ 500
Interest rate (as a percent)									12.00%
Common Stock
Debt Conversion [Line Items]
Shares issued for settlement of debt and warrants (in shares)	591,802
Securities Purchase Agreement and Future Advance Convertible Promissory Notes
Debt Conversion [Line Items]
Interest expense				$ 0	$ 1,500	$ 0	$ 4,300
Conversion price (in dollars per share)				$ 15.00		$ 15.00
Interest rate (as a percent)				15.00%		15.00%
Number of trading days						5 days
Debt instrument, term						12 months
Securities Purchase Agreement and Future Advance Convertible Promissory Notes \| Maximum
Debt Conversion [Line Items]
Conversion price (in dollars per share)				$ 3.75		$ 3.75
Share price (in dollars per share)				$ 15.00		$ 15.00
Securities Purchase Agreement and Future Advance Convertible Promissory Notes \| First Warrant
Debt Conversion [Line Items]
Warrants to purchase common stock (in shares)									1,900,000
Warrant exercise price (in dollars per share)									$ 25.13
Securities Purchase Agreement and Future Advance Convertible Promissory Notes \| Second Warrant
Debt Conversion [Line Items]
Warrants to purchase common stock (in shares)									1,900,000
Warrant exercise price (in dollars per share)									$ 15.00
ABS Promissory Notes \| Securities Purchase Agreement and Future Advance Convertible Promissory Notes
Debt Conversion [Line Items]
Secured term loan									$ 1,300	$ 4,600	$ 1,900	$ 1,200	$ 4,000	$ 16,200