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Leases - Additional Information (Detail) $ in Thousands	Dec. 01, 2019 ft²	Mar. 31, 2021 USD ($)
Operating lease right of use assets		$ 8,700
Operating lease liabilities		$ 8,508
Accounting Standards Update 2016-02 [Member] | San Diego California [Member]
Number of square feet under lease | ft²	32,800
Lease expire date	Mar. 31, 2028

X

- Definition

Initial recognition of operating lease right of use asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	meip_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number of square feet under lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	meip_
Data Type:	xbrli:integerItemType
Balance Type:	na
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

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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Namespace Prefix:
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