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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 |

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- 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

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- 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

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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