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Fair Value Measurement - Additional Information (Details) - $ / shares		1 Months Ended		12 Months Ended
	Feb. 27, 2019	Jan. 24, 2014	Sep. 12, 2013	Jun. 30, 2019	Oct. 27, 2019	Jun. 30, 2018	Sep. 30, 2014
Warrant Expiration Term	5 years 6 months
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.61				$ 0.61
Percentage of Market Triggering Event	100.00%
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 6.05
Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 5.25
Placement Agents [Member]
Class of Warrant or Right, Outstanding				0		5,425,222
Warrant Expiration Term		5 years	5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 6.05	$ 5.25
Warrant [Member]
Class of Warrant or Right, Outstanding	6,944,446
Warrant Expiration Term	5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.61
Percentage of Market Triggering Event				100.00%
Percentage of Probability				0.00%
Warrant [Member] | Maximum [Member]
Percentage of Probability				10.00%
Warrant [Member] | Minimum [Member]
Percentage of Probability				1.00%

X

- Definition

The percentage of market triggering event.

+ References

No definition available.

+ Details

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Namespace Prefix:	nnvc_
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Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of probability.

+ References

No definition available.

+ Details

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Namespace Prefix:	nnvc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reflects the term of warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	nnvc_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Period Type:	instant

X

- Details

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- Details

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- Details

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X

- Details

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