Revenue Recognition - Schedule of Changes in Deferred Revenue from Contract Liabilities (Parenthetical) (Details) - USD ($) $ in Thousands	Jan. 01, 2024	Jan. 01, 2023
Revenue From Contract With Customer [Abstract]
Recognition of unearned revenue	$ 1,787	$ 1,787

Contract with customer liability recognition of unearned revenue.

No definition available.

Name:	celu_ContractWithCustomerLiabilityRecognitionOfUnearnedRevenue
Namespace Prefix:	celu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration