XML 48 R37.htm IDEA: XBRL DOCUMENT
v3.22.1

Leases - Additional Information (Detail) $ in Thousands | 6 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) ft² | Jul. 31, 2020 USD ($)
Lease expire date | Mar. 31, 2028 |
Operating lease right of use assets |  | $ 8,700
Operating lease liabilities, Total | $ 7,842 | $ 8,700
Accounting Standards Update 2016-02 [Member] | San Diego California [Member] |  |
Number of square feet under lease | ft² | 32,800 |

X
- Definition Initial recognition of operating lease right of use asset. + References No definition available. + Details
Name: | meip_InitialRecognitionOfOperatingLeaseRightOfUseAsset
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
Name: | meip_NumberOfSquareFeetUnderLease
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 YYYY-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=123391704&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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: |