XML 47 R35.htm IDEA: XBRL DOCUMENT
v3.19.1

Commitments and Contingencies (Details Textual) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 15, 2016 | Nov. 30, 2017 USD ($) | Oct. 27, 2017 USD ($) ft² | Dec. 31, 2017 USD ($) shares
Loss Contingencies [Line Items] |  |  |  |
Number Of Shares To Be Issued Upon Legal Settlement | shares |  |  |  | 200,000
Litigation Settlement, Expense |  | $ 200,000 |  |
Litigation Settlement, Amount Awarded to Other Party |  |  |  | $ 2,000,000
Operating Leases, Rent Expense, Sublease Rentals |  |  | $ 0.6 |
Operating Leases, Rent Expense, Net |  |  | $ 3.6 |
Land Subject to Ground Leases | ft² |  |  | 27,043 |
Security Deposit |  |  | $ 800,000 |
Increase (Decrease) in Security Deposits |  |  | 1,300,000 |
Letter of Credit [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Security Deposit |  |  | 500,000 |
Increase (Decrease) in Security Deposits |  |  | 1,000,000 |
Cash [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Security Deposit |  |  | 300,000 |
Increase (Decrease) in Security Deposits |  |  | $ 300,000 |
City Of Hope [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Failed Contingency Damages Awarded Percentage | 15.00% |  |  |

X
- Definition Percentage of failed contingency damages awarded to the plaintiff in the legal matter. + References No definition available. + Details
Name: | mbio_FailedContingencyDamagesAwardedPercentage
Namespace Prefix: | mbio_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares which will be issued upon legal settlement. + References No definition available. + Details
Name: | mbio_NumberOfSharesToBeIssuedUponLegalSettlement
Namespace Prefix: | mbio_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The increase (decrease) during the reporting period in security deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInSecurityDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Area of land subject to a ground lease. + References No definition available. + Details
Name: | us-gaap_LandSubjectToGroundLeases
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
Name: | us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SecurityDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_CashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=mbio_CityOfHopeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |