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Note 14 - Stockholders' Equity - Outstanding Warrants (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2021 $ / shares shares
Outstanding warrants (in shares) | shares | 7,067
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ / shares | $ 1.63
Warrants granted (in shares) | shares | 15
Warrants granted, weighted average exercise price (in dollars per share) | $ / shares | $ 0.67
Warrants expired (in shares) | shares | 0
Warrants expired, weighted average exercise price (in dollars per share) | $ / shares | $ 0
Outstanding warrants (in shares) | shares | 7,082
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ / shares | $ 1.63

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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant