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Commitments and Contingencies - Additional Information (Details) $ in Thousands				1 Months Ended	3 Months Ended	9 Months Ended
	May 05, 2021 USD ($)	Nov. 01, 2019 USD ($)	Mar. 13, 2019 USD ($) ft²	Sep. 30, 2017	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Commitments And Contingencies Details [Line Items]
Area of building \| ft²						150,000
Restricted cash					$ 14,722	$ 14,722		$ 15,202
Rent expense						602	$ 1,277
Contingent consideration					255,522	255,522		273,367
CTH
Commitments And Contingencies Details [Line Items]
Estimated liability					5,266	5,266
Legacy Celularity
Commitments And Contingencies Details [Line Items]
Restricted cash								481
Lease financing obligation					28,022	28,022
Current liability					3,046	3,046
Legacy Celularity \| Palantir Technologies, Inc \| Master Subscription Agreement
Commitments And Contingencies Details [Line Items]
Payments for master subscription agreement	$ 40,000
Payment subscription period	5 years
Annual fee paid					6,000
Costs related to master subscription agreement						2,500
Legacy Celularity \| HLI Cellular Therapeutics, LLC \| Anthrogenesis
Commitments And Contingencies Details [Line Items]
Contingent consideration					255,522	255,522		273,367
Office Space \| Warren, New Jersey \| Legacy Celularity
Commitments And Contingencies Details [Line Items]
Operating lease expiry year				2022
Office and Laboratory Space \| Cedar Knolls, New Jersey \| Legacy Celularity
Commitments And Contingencies Details [Line Items]
Percentage increase in base annual rent		2.00%
Monthly lease payments		$ 15
Office, Manufacturing and Laboratory Space \| Florham Park, New Jersey \| Legacy Celularity
Commitments And Contingencies Details [Line Items]
Operating lease expiry year			2036
Area of building \| ft²			147,215
Option to renew lease term period			5 years
Operating lease commencement date			Mar. 01, 2020
Initial monthly base rent			$ 230
Restricted cash					$ 14,722	$ 14,722		14,722
Tenant improvement allowance			$ 14,722
Construction in Progress \| Legacy Celularity
Commitments And Contingencies Details [Line Items]
Construction-in-progress property and equipment								$ 15,415	$ 28,062