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Fair Value Measurements (Details) - Schedule of change in the fair value of the derivative warrant liabilities - USD ($)	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021
Schedule of change in the fair value of the derivative warrant liabilities [Abstract]
Warrant liabilities at beginning	$ 12,730,001	$ 9,816,668
Change in fair value of derivative warrant liabilities	(1,013,331)	2,913,334
Derivative warrant liabilities at ending	$ 11,716,670	$ 12,730,001

X

- Definition

Fair value of Derivative warrant liabilities.

+ References

No definition available.

+ Details

Name:	ngac_DerivativeWarrantLiabilitiesBalance
Namespace Prefix:	ngac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Change in fair value of derivative warrant liabilities.

+ References

No definition available.

+ Details

Name:	ngac_FairValueAdjustmentOfWarrant
Namespace Prefix:	ngac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ngac_ScheduleOfChangeInTheFairValueOfTheDerivativeWarrantLiabilitiesAbstract
Namespace Prefix:	ngac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration