XML 54 R44.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Stockholders' Equity (Warrants Activity) (Details) - $ / shares | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021 | Mar. 04, 2022
Runway Debt Facility |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price (in dollars per share) |  |  | $ 0.8021
Warrants issued |  |  | 748,036
Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants outstanding, beginning | 3,308,654 |  |
Warrants, expired | (3,003,770) |  |
Warrants granted | 748,036 |  |
Warrants outstanding, ending | 1,052,920 | 3,308,654 |
Warrant exercise price (in dollars per share) | $ 1.52 | $ 8.02 |
Warrants exercise price, expired (in dollars per share) | 8.50 |  |
Warrant exercise price, grants during the period (in dollars per share) | $ 0.80 |  |
Warrants outstanding, remaining contractual life | 8 years 6 months 14 days | 8 months 23 days |
Warrants granted, remaining contractual life | 9 years 5 months 4 days |  |

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

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

X
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of warrants that were granted during the period. + References No definition available. + Details
Name: | mbio_ClassOfWarrantOrRightWeightedAverageExercisePriceGrantsDuringPeriod
Namespace Prefix: | mbio_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average remaining contractual life for warrants outstanding. + References No definition available. + Details
Name: | mbio_ClassOfWarrantOrRightWeightedAverageRemainingContractualLife
Namespace Prefix: | mbio_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average remaining contractual life for warrants granted during the period. + References No definition available. + Details
Name: | mbio_ClassOfWarrantOrRightWeightedAverageRemainingContractualLifeGrantsInPeriod
Namespace Prefix: | mbio_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrant exercise price, expired during the period. + References No definition available. + Details
Name: | mbio_WarrantExercisePriceExpiredDuringPeriod
Namespace Prefix: | mbio_
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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mbio_RunwayDebtFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |