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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
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

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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