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Collaboration Agreements (Details) - Research Collaboration and Co-Development Agreement $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2022 item	Dec. 31, 2023 USD ($)
Collaboration Agreements
Maximum number of antibody drug conjugates to be developed | item	3
Collaboration agreements cost sharing percentage (as a percent)	50.00%	50.00%
Collaboration arrangement reduction in expenses | $		$ 0.5

X

- Definition

Represents the collaboration agreements cost sharing percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	nxtc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of collaborative arrangement reduction in expense.

+ References

No definition available.

+ Details

Name:	nxtc_CollaborativeArrangementReductionInExpenseAmount
Namespace Prefix:	nxtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the maximum number of antibody drug conjugates to be developed.

+ References

No definition available.

+ Details

Name:	nxtc_MaximumNumberOfAntibodyDrugConjugatesToBeDeveloped
Namespace Prefix:	nxtc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479402/808-10-50-1

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: