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Note 12 - Stockholders' Equity - Outstanding Warrants (Details) shares in Thousands | 3 Months Ended
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Mar. 31, 2023 $ / shares shares
Outstanding warrants (in shares) | shares | 2,306
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ / shares | $ 7.70
Warrants granted (in shares) | shares | 0
Warrants granted, weighted average exercise price (in dollars per share) | $ / shares | $ 0
Warrants expired (in shares) | shares | 0
Warrants expired, weighted average exercise price (in dollars per share) | $ / shares | $ 0

X
- Definition The number of warrants or rights forfeited during period. + References No definition available. + Details
Name: | nby_ClassOfWarrantOrRightForfeitedDuringPeriod
Namespace Prefix: | nby_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price per share of warrants or rights forfeited during period. + References No definition available. + Details
Name: | nby_ClassOfWarrantOrRightForfeitedDuringPeriodWeightedAverageExercisePrice
Namespace Prefix: | nby_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of warrants or rights issued during period. + References No definition available. + Details
Name: | nby_ClassOfWarrantOrRightIssuedDuringPeriod
Namespace Prefix: | nby_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price per share of warrants or rights issued during period. + References No definition available. + Details
Name: | nby_ClassOfWarrantOrRightIssuedDuringPeriodWeightedAverageExercisePrice
Namespace Prefix: | nby_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant