XML 30 R20.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Clinical Trial and Sponsored Research Agreements (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2022
Sponsored Research and Clinical Trial Agreements [Member] |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
Schedule of Clinical Trial and Sponsored Research Agreements | For the three and nine months ended September 30, 2022 and 2021, the Company recorded the following expense in research and development for sponsored research and clinical trial agreements in the Unaudited Statements of Operations pursuant to the terms of this agreement: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
($ in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
City of Hope National Medical Center | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
CD123 | ​ | ​ | 62 | ​ | ​ | 24 | ​ | ​ | 165 | ​ | ​ | 250
IL13Rα2 | ​ | ​ | 192 | ​ | ​ | 199 | ​ | ​ | 654 | ​ | ​ | 992
CS1 | ​ | ​ | 187 | ​ | ​ | 138 | ​ | ​ | 287 | ​ | ​ | 510
HER2 | ​ | ​ | 691 | ​ | ​ | 319 | ​ | ​ | 1,233 | ​ | ​ | 473
PSCA | ​ | ​ | 27 | ​ | ​ | 23 | ​ | ​ | 77 | ​ | ​ | 69
Fred Hutchinson Cancer Center - CD20 | ​ | ​ | 132 | ​ | ​ | 492 | ​ | ​ | 978 | ​ | ​ | 1,490
St. Jude Children's Research Hospital - XSCID | ​ | ​ | 184 | ​ | ​ | 330 | ​ | ​ | 402 | ​ | ​ | 610
LUMC - RAG1 SCID | ​ | ​ | 92 | ​ | ​ | — | ​ | ​ | 357 | ​ | ​ | —
Mayo Clinic | ​ | ​ | 269 | ​ | ​ | 231 | ​ | ​ | 731 | ​ | ​ | 464
Total | ​ | $ | 1,836 | ​ | $ | 1,756 | ​ | $ | 4,884 | ​ | $ | 4,858

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_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 808 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434 + Details
Name: | us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=mbio_SponsoredResearchAndClinicalTrialAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |