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Statutory Reserves (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 USD ($)
Statutory Reserves [Line Items]
Percentage of income tax rate	10.00%
Percentage of reserve capital	50.00%
Statutory reserve		¥ 6,647,109

X

- Definition

Percentage of reserve capital.

+ References

No definition available.

+ Details

Name:	ck0001872302_PercentageOfReserveCapital
Namespace Prefix:	ck0001872302_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of statutory reserve.

+ References

No definition available.

+ Details

Name:	ck0001872302_StatutoryReserve
Namespace Prefix:	ck0001872302_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ck0001872302_StatutoryReservesLineItems
Namespace Prefix:	ck0001872302_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-12

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration