Schedule of Financial Assets and Liabilities Measures at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Liabilities:
Short-term debt - Yorkville	$ 2,485	$ 17,223
Assets:
Convertible note receivable		2,072
Fair Value, Recurring [Member]
Liabilities:
Acquisition-related contingent consideration obligations	1,413	1,606
Contingent stock consideration	27	27
Short-term debt - Yorkville	1,865	17,223
Short-term debt - unsecured senior convertible notes	620
Warrant liability - July 2023 Registered Direct Warrants	1,115	1,529
Warrant liability - April 2023 Registered Direct Warrants	1,022	1,487
Warrant liability - May 2022 PIPE Warrants	505	708
Warrant liability - November 2024 Purchaser Warrants	278
Warrant liability - November 2024 Placement Agent Warrants	48
Warrant liability - Sponsor Warrants	9	60
Warrant liability - Public Warrants	287	575
Total fair value liabilities	7,189	23,215
Assets:
Convertible note receivable		2,072
Total fair value assets		2,072
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities:
Acquisition-related contingent consideration obligations
Contingent stock consideration
Short-term debt - Yorkville
Short-term debt - unsecured senior convertible notes
Warrant liability - July 2023 Registered Direct Warrants
Warrant liability - April 2023 Registered Direct Warrants
Warrant liability - May 2022 PIPE Warrants
Warrant liability - November 2024 Purchaser Warrants
Warrant liability - November 2024 Placement Agent Warrants
Warrant liability - Sponsor Warrants
Warrant liability - Public Warrants	287	575
Total fair value liabilities	287	575
Assets:
Convertible note receivable
Total fair value assets
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities:
Acquisition-related contingent consideration obligations
Contingent stock consideration
Short-term debt - Yorkville
Short-term debt - unsecured senior convertible notes
Warrant liability - July 2023 Registered Direct Warrants
Warrant liability - April 2023 Registered Direct Warrants
Warrant liability - May 2022 PIPE Warrants
Warrant liability - November 2024 Purchaser Warrants
Warrant liability - November 2024 Placement Agent Warrants
Warrant liability - Sponsor Warrants
Warrant liability - Public Warrants
Total fair value liabilities
Assets:
Convertible note receivable
Total fair value assets
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Liabilities:
Acquisition-related contingent consideration obligations	1,413	1,606
Contingent stock consideration	27	27
Short-term debt - Yorkville	1,865	17,223
Short-term debt - unsecured senior convertible notes	620
Warrant liability - July 2023 Registered Direct Warrants	1,115	1,529
Warrant liability - April 2023 Registered Direct Warrants	1,022	1,487
Warrant liability - May 2022 PIPE Warrants	505	708
Warrant liability - November 2024 Purchaser Warrants	278
Warrant liability - November 2024 Placement Agent Warrants	48
Warrant liability - Sponsor Warrants	9	60
Warrant liability - Public Warrants
Total fair value liabilities	$ 6,902	22,640
Assets:
Convertible note receivable		2,072
Total fair value assets		$ 2,072

Contingent stock consideration.

No definition available.

Name:	CELU_ContingentStockConsideration
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Short-term debt unsecured senior convertible notes.

+ References

No definition available.

+ Details

Name:	CELU_ShorttermDebtUnsecuredSeniorConvertibleNotes
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Warrant liability placement agent warrants.

+ References

No definition available.

+ Details

Name:	CELU_WarrantLiabilityPlacementAgentWarrants
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Warrant liability private investment in public equity warrants.

+ References

No definition available.

+ Details

Name:	CELU_WarrantLiabilityPrivateInvestmentInPublicEquityWarrants
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Warrant liability public warrants.

+ References

No definition available.

+ Details

Name:	CELU_WarrantLiabilityPublicWarrants
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Warrant liability purchaser warrants.

+ References

No definition available.

+ Details

Name:	CELU_WarrantLiabilityPurchaserWarrants
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Warrant liability registered direct warrants.

+ References

No definition available.

+ Details

Name:	CELU_WarrantLiabilityRegisteredDirectWarrants
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Warrant liability registered direct warrants two.

+ References

No definition available.

+ Details

Name:	CELU_WarrantLiabilityRegisteredDirectWarrantsTwo
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Warrant liability sponsor warrants.

+ References

No definition available.

+ Details

Name:	CELU_WarrantLiabilitySponsorWarrants
Namespace Prefix:	CELU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 35
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479613/805-30-35-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-1

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479668/805-30-25-6

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_ReceivablesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_ShorttermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: