Promissory Notes Payable - Convertible Notes Payable and Convertible Notes Payable, Related Parties (Details) - USD ($)			1 Months Ended			12 Months Ended
	Oct. 18, 2024	May 31, 2024	Nov. 30, 2023	Aug. 31, 2023	Aug. 31, 2020	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024	Jan. 31, 2024	Jul. 31, 2023	May 31, 2023	Dec. 31, 2022	Nov. 30, 2022	Aug. 31, 2022
Debt Conversion [Line Items]
Principal							$ 8,462,000
Warrant exercise price (in dollars per share)						$ 4.05	$ 22.50					$ 26.25
Shares issued for settlement of debt and warrants (in shares)		100,000
Outstanding principal, amount converted	$ 8,900,000	$ 1,200,000
Interest converted		$ 200,000
Gain on conversion of the Notes	$ 300,000
Gain on extinguishment of debt						$ 6,326,000	$ 0
Related Party
Debt Conversion [Line Items]
Interest expense						1,214,000	2,677,000
Accrued interest						0	669,000
Reduction in accrued interest						(3,387,000)	(6,306,000)
Acquisition convertible promissory note, in default
Debt Conversion [Line Items]
Principal							$ 4,000,000
Conversion Price (in dollars per share)							$ 37.50
Acquisition convertible promissory note, in default | Related Party
Debt Conversion [Line Items]
Principal								$ 500,000
Interest rate								12.00%
Convertible promissory note payable, related parties, in default
Debt Conversion [Line Items]
Principal					$ 1,400,000		$ 1,373,000
Conversion Price (in dollars per share)							$ 37.50
Accrued interest						0	$ 444,000
Repayments of convertible debt						1,400,000
Gain on extinguishment of debt						800,000
Reduction in accrued interest						800,000
Celularity's UltraMIST Assets | Acquisition convertible promissory note, in default
Debt Conversion [Line Items]
Interest rate					12.00%
Aggregate consideration paid for the assets					$ 24,000,000
Issuance of promissory notes					$ 4,000,000
Accrued interest rate					5.00%
Accrued interest						0	1,500,000
Repayments of other debt						2,200,000
Common Stock
Debt Conversion [Line Items]
Shares issued for settlement of debt and warrants (in shares)	591,802
ABS Promissory Notes
Debt Conversion [Line Items]
Principal							4,584,000			$ 4,600,000
Interest expense						100,000
Interest rate										0.00%
Gain on extinguishment of debt						(100,000)
ABS Promissory Notes | Related Party
Debt Conversion [Line Items]
Principal							1,462,000
August Issued 2022 Convertible Promissory Notes
Debt Conversion [Line Items]
Principal				$ 16,200,000
Interest expense				$ 2,400,000
August Issued 2022 Convertible Promissory Notes | Common Stock
Debt Conversion [Line Items]
Shares issued for settlement of debt and warrants (in shares)				1,238,508
November Issued 2022 Convertible Promissory Notes
Debt Conversion [Line Items]
Principal			$ 4,000,000.0
Interest expense			$ 600,000
November Issued 2022 Convertible Promissory Notes | Common Stock
Debt Conversion [Line Items]
Shares issued for settlement of debt and warrants (in shares)			305,282
Securities Purchase Agreement and Future Advance Convertible Promissory Notes
Debt Conversion [Line Items]
Interest expense						$ 5,000,000.0	$ 6,400,000
Conversion Price (in dollars per share)						$ 15
Interest rate						15.00%
Number of trading days						5 days
Debt instrument, term						12 months
Securities Purchase Agreement and Future Advance Convertible Promissory Notes | ABS Promissory Notes
Debt Conversion [Line Items]
Principal						$ 1,900,000		$ 1,300,000	$ 4,600,000		$ 1,200,000		$ 4,000,000.0	$ 16,200,000
Securities Purchase Agreement and Future Advance Convertible Promissory Notes | Maximum
Debt Conversion [Line Items]
Conversion Price (in dollars per share)						$ 3.75
Share price						$ 15
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