Revenue Recognition (Details) - Schedule of disaggregated revenue by product and services - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Schedule of disaggregated revenue by product and services [Abstract]
Product sales and rentals	$ 840	$ 2,792	$ 6,854	$ 15,357
Services	1,264	1,416	5,556	5,790
License, royalty and other	556		1,868
Net revenues	$ 2,660	$ 4,208	$ 14,278	$ 21,147

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

No definition available.

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