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Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Restricted cash held as a certificate of deposit	$ 324	$ 332
Deposit held as a certificate of deposit	152	152
Total assets	476	484
Combined embedded derivative liability	169
Total liabilities	169
Fair Value, Inputs, Level 1 [Member]
Restricted cash held as a certificate of deposit	324	332
Deposit held as a certificate of deposit	152	152
Total assets	476	484
Combined embedded derivative liability	0
Total liabilities	0
Fair Value, Inputs, Level 2 [Member]
Restricted cash held as a certificate of deposit	0	0
Deposit held as a certificate of deposit	0	0
Total assets	0	0
Combined embedded derivative liability	169
Total liabilities	169
Fair Value, Inputs, Level 3 [Member]
Restricted cash held as a certificate of deposit	0	0
Deposit held as a certificate of deposit	0	0
Total assets	0	$ 0
Combined embedded derivative liability	0
Total liabilities	$ 0

X

- Definition

Fair value portion of deposit held as a certificate of deposit.

+ References

No definition available.

+ Details

Name:	nby_DepositHeldAsACertificateOfDepositFairValueDisclosure
Namespace Prefix:	nby_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of restricted cash held as a certificate of deposit.

+ References

No definition available.

+ Details

Name:	nby_RestrictedCashHeldAsACertificateOfDepositFairValueDisclosure
Namespace Prefix:	nby_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B

+ Details

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

X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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

X

- Details

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Balance Type:
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- Details

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X

- Details

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- Details

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