Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands										1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 16, 2024	Feb. 15, 2024	Jan. 12, 2024	Jul. 31, 2023	May 18, 2023	Apr. 10, 2023	Mar. 20, 2023	Mar. 14, 2023	Sep. 08, 2022	Jul. 31, 2023	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 13, 2024	Feb. 22, 2024	Dec. 31, 2023	Sep. 14, 2023	May 18, 2022
Stockholders Equity Details [Line Items]
Common stock, shares authorized												730,000,000				730,000,000
Common stock, par value												$ 0.0001				$ 0.0001
Common stock, shares issued												21,984,614				19,378,192
Common stock, shares outstanding												21,984,614				19,378,192
Common stock, voting Rights												common stock are entitled to one vote per share
Preferred stock, shares authorized												10,000,000				10,000,000
Preferred stock, shares issued												0				0
Preferred stock, shares outstanding												0				0
Class of warrant or right, outstanding												10,905,901
Warrants outstanding to purchase shares of common stock				892,856						892,856
Fair value of modified warrant, incremental expense											$ 402		$ 402
Purchase price of per share				$ 3.5		$ 6.5	$ 8.34			$ 3.5
Aggregate purchase price												$ 6,000	12,750
Exercise price				$ 3.5		$ 7.5				3.5				$ 8.1
Warrant term				5 years		5 years
Reduced exercise price										$ 3.5
Additional warrant liability						$ 1,389
Warrant liabilities				$ 511						$ 511		4,403				$ 4,359
Daily interest accruing rate			18.00%
Fair value of the warrant liability				2,645		4,280				$ 2,645		$ 4,259				$ 3,784
Proceeds from the exercise of warrants				$ 3,000		$ 6,000
2024 Warrant Repricing
Stockholders Equity Details [Line Items]
Exercise price			$ 2.4898
Number of warrants repriced			652,981
Fair value of warrant modification for equity issuance cost			$ 524
Chief Administrative Officer | Amended Employment Agreement
Stockholders Equity Details [Line Items]
Base salary	$ 425	$ 500
March 2023 PIPE Warrants
Stockholders Equity Details [Line Items]
Class of warrant or right, outstanding												208,485
Aggregate purchase price							$ 9,000
Exercise price												$ 30
Warrants and rights outstanding, expire date												Mar. 27, 2028
Term (years)												5 years
Reduced exercise price								$ 10
Adjusted advance notice period							61 days
Premium paid for private placement purchase							$ 1,650
March 2023 PIPE Warrants | Private Placement | Chairman And Chief Executive Officer
Stockholders Equity Details [Line Items]
Aggregate purchase price							$ 2,000
January 2024 PIPE
Stockholders Equity Details [Line Items]
Proceeds from private placements			$ 909
ATM Agreement
Stockholders Equity Details [Line Items]
Sales agents commission rate												3.00%
Net proceeds from sale of common stock													136
Gross proceeds from sale of common stock													$ 141
April 2023 Registered Direct Warrants (Modified)
Stockholders Equity Details [Line Items]
Class of warrant or right, outstanding												487,451
Exercise price												$ 3.5
Warrants and rights outstanding, expire date												Oct. 10, 2028
May 2022 PIPE Warrants
Stockholders Equity Details [Line Items]
Class of warrant or right, outstanding												405,405
Exercise price												$ 3.5
Warrants and rights outstanding, expire date												Oct. 10, 2028
Reduced exercise price						$ 7.5
Amended termination date description						date to five and one-half years following the closing of the offering
May 2023 PIPE Warrants
Stockholders Equity Details [Line Items]
Class of warrant or right, outstanding												581,394
Aggregate purchase price					$ 3,750
Exercise price					$ 10							$ 10
Warrants and rights outstanding, expire date					May 17, 2028							May 17, 2028
Adjusted advance notice period					61 days
Minimum | Investor Rights Agreement | Dragasac Limited
Stockholders Equity Details [Line Items]
Percentage of partial liquidating damages on subscription amount			1.00%
Minimum | Legacy Celularity | Preferred Stock
Stockholders Equity Details [Line Items]
Percentage of shares required for voting												50.00%
Maximum
Stockholders Equity Details [Line Items]
Exercise price				$ 7.5						$ 7.5
Maximum | Investor Rights Agreement | Dragasac Limited
Stockholders Equity Details [Line Items]
Percentage of partial liquidating damages on subscription amount			6.00%
Class A Common Stock
Stockholders Equity Details [Line Items]
Common stock, shares authorized												730,000,000				730,000,000
Common stock, par value												$ 0.0001			$ 0.0001	$ 0.0001
Common stock, shares issued												21,984,614				19,378,192
Common stock, shares outstanding												21,984,614				19,378,192
Class of warrant or right, outstanding												10,905,901
Warrants outstanding to purchase shares of common stock				857,142		923,076				857,142
Purchase and sale of shares				857,143		923,077
Class A Common Stock | 2024 Warrant Repricing
Stockholders Equity Details [Line Items]
Exercise price			$ 67.7									$ 67.7
Class A Common Stock | March 2023 PIPE Warrants
Stockholders Equity Details [Line Items]
Warrants outstanding to purchase shares of common stock																	729,698
Purchase price of per share																	$ 30
Purchase and sale of shares							938,184
Class A Common Stock | March 2023 PIPE Warrants | Private Placement
Stockholders Equity Details [Line Items]
Purchase price of per share							$ 1.25
Class A Common Stock | January 2024 PIPE
Stockholders Equity Details [Line Items]
Aggregate purchase price			$ 6,000
Class A Common Stock | January 2024 PIPE | Private Placement
Stockholders Equity Details [Line Items]
Common stock, par value			$ 0.0001
Purchase price of per share			1.25
Exercise price			$ 2.4898
Warrants and rights outstanding, expire date			Jan. 16, 2029
Term (years)			5 years
Warrants and rights issued closing date			Jan. 16, 2024
Purchase and sale of shares			2,141,098
Class A Common Stock | May 2022 PIPE Warrants
Stockholders Equity Details [Line Items]
Purchase price of per share																		$ 82.5
Class A Common Stock | May 2023 PIPE Warrants
Stockholders Equity Details [Line Items]
Purchase price of per share					$ 5.2
Purchase and sale of shares					581,395
Class A Common Stock | May 2023 PIPE Warrants | Private Placement
Stockholders Equity Details [Line Items]
Purchase price of per share					$ 1.25
Class A Common Stock | Maximum | March 2023 PIPE Warrants | Private Placement
Stockholders Equity Details [Line Items]
Warrants outstanding to purchase shares of common stock							938,183
Class A Common Stock | Maximum | January 2024 PIPE | Private Placement
Stockholders Equity Details [Line Items]
Warrants outstanding to purchase shares of common stock			535,274
Class A Common Stock | Maximum | May 2023 PIPE Warrants | Private Placement
Stockholders Equity Details [Line Items]
Warrants outstanding to purchase shares of common stock					581,394
Common Stock | ATM Agreement
Stockholders Equity Details [Line Items]
Aggregate offering price									$ 150,000
Purchase and sale of shares												0	13,296
Average price per share											$ 10.6		$ 10.6