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Stockholders' Equity (Warrants Activity) (Details) - Warrants [Member] - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Class of Warrant or Right [Line Items] |  |
Warrants outstanding, beginning | 5,402,670 |
Warrants, expired | (666,366) |
Warrants exercised | (138) |
Warrants outstanding, ending | 4,736,166 | 5,402,670
Warrant exercise price (in dollars per share) | $ 8.16 | $ 8.21
Warrants exercise price, expired (in dollars per share) | 8.50 |
Warrant exercise price, exercised during the period (in dollars per share) | $ 0 |
Warrants outstanding, remaining contractual life | 8 months 23 days | 1 year 4 months 20 days

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

X
- Definition The number of warrants or rights expired during the period. + References No definition available. + Details
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X
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of warrants that were exercised during the period. + References No definition available. + Details
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Namespace Prefix: | mbio_
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Balance Type: | na
Period Type: | duration

X
- Definition The weighted average remaining contractual life for warrants outstanding. + References No definition available. + Details
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Namespace Prefix: | mbio_
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- Definition Warrant exercise price, expired during the period. + References No definition available. + Details
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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=109259400&loc=d3e21475-112644 + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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- Details
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