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Leases - Additional Information (Detail) - Accounting Standards Update 2016-02 [Member] - San Diego California [Member] $ in Millions | Dec. 01, 2019 USD ($) ft²
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Number of square feet under lease | ft² | 32,800
Average Annual Lease Payments | $ 1.5
Contractual obligation | $ 11.5
Lease expire date | Mar. 31, 2028

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- Definition Average annual lease payments. + References No definition available. + Details
Name: | meip_AverageAnnualLeasePayments
Namespace Prefix: | meip_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of square feet under lease. + References No definition available. + Details
Name: | meip_NumberOfSquareFeetUnderLease
Namespace Prefix: | meip_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=meip_SanDiegoCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |