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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	Dec. 31, 2023	Dec. 31, 2022
Restricted cash held as a certificate of deposit	$ 476	$ 484
Warrant liability	334
Fair Value, Inputs, Level 1 [Member]
Restricted cash held as a certificate of deposit	476	484
Warrant liability	0
Fair Value, Inputs, Level 2 [Member]
Restricted cash held as a certificate of deposit	0	0
Warrant liability	0
Fair Value, Inputs, Level 3 [Member]
Restricted cash held as a certificate of deposit	0	$ 0
Warrant liability	$ 334

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

The fair value of warrant obligations.

+ References

No definition available.

+ Details

Name:	nby_WarrantLiabilitiesFairValueDisclosure
Namespace Prefix:	nby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: