Period the entity reimburses for cost of continuing COBRA coverage.

No definition available.

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Balance Type:	na
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- Definition

Contingent payment that will become due upon achievement of target objectives.

+ References

No definition available.

+ Details

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Namespace Prefix:	novn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of former executives of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	novn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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Period Type:	duration

- Definition

Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of minimum net capital required to be maintained to engage in securities transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

+ Details

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

- Definition

Cash received from licensees for license fees during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Details

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- Details

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Balance Type:
Period Type:

- Details

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Subsequent Events (Details)							1 Months Ended
Subsequent Events (Details)	Mar. 14, 2019 JPY (¥)	Mar. 14, 2019 USD ($)	Oct. 23, 2018 JPY (¥)	Oct. 23, 2018 USD ($)	Jan. 19, 2017 JPY (¥)	Jan. 19, 2017 USD ($)	Jan. 31, 2019 USD ($) officer	Jan. 14, 2019 USD ($)
Amended Sato Agreement
Subsequent Event [Line Items]
Payment received under license agreement			¥ 250,000,000	$ 2,224,000	¥ 1,250,000,000	$ 10,813,000
Subsequent event
Subsequent Event [Line Items]
Minimum net capital required								$ 50,000,000.0
Subsequent event \| Amended Sato Agreement
Subsequent Event [Line Items]
Payment received under license agreement	¥ 500,000,000	$ 4,460,000
Subsequent event \| Two Former Officers
Subsequent Event [Line Items]
Number of former officers \| officer							2
Separation benefits							$ 880,000
Contractual term of separation benefits							12 months
COBRA coverage period							12 months
Subsequent event \| One Former Officer
Subsequent Event [Line Items]
Number of former officers \| officer							1
Contingent payment due upon achievement of target corporate development project objectives							$ 61,000