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v3.22.1

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | May 09, 2022 | Mar. 31, 2022
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Subsequent Event |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |
Minimum bid price per share | $ 1.00 |
Presage License Agreement |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |
Accrued payment for potential future payments |  | $ 0

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- 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 Minimum Bid Price Per Share + References No definition available. + Details
Name: | meip_MinimumBidPricePerShare
Namespace Prefix: | meip_
Data Type: | dtr-types:perShareItemType
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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: |