XML 46 R33.htm IDEA: XBRL DOCUMENT
v3.20.4

Commitments and Contingencies - Additional Information (Detail) | 6 Months Ended
--- | ---
Dec. 31, 2020 USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items] |
Future aggregate milestone payments | $ 74,500,000
Percentage of Purchase Requirement | 100.00%
S*Bio Purchase Agreement |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |
Accrued payment for potential future payments | $ 0
CyDex License Agreement |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |
Accrued payment for potential future payments | 0
Presage License Agreement |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |
Accrued payment for potential future payments | $ 0

X
- Definition Accrued milestone payments. + References No definition available. + Details
Name: | meip_AccruedMilestonePayments
Namespace Prefix: | meip_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Milestone payments, maximum amount. + References No definition available. + Details
Name: | meip_MilestonePaymentsMaximumAmount
Namespace Prefix: | meip_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of purchases from major suppliers. + References No definition available. + Details
Name: | meip_PercentageOfPurchasesFromMajorSuppliers
Namespace Prefix: | meip_
Data Type: | num:percentItemType
Balance Type: | na
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_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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