Name:	meip_IncomeTaxesLineItemsLineItems
Namespace Prefix:	meip_
Data Type:	xbrli:stringItemType
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Period Type:	duration

Interest Expense Income As Percentage Of Adjustable Taxable Income

No definition available.

Name:	meip_InterestExpenseIncomeAsPercentageOfAdjustableTaxableIncome
Namespace Prefix:	meip_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Taxable income percentage.

No definition available.

Name:	meip_TaxableIncomePercentage
Namespace Prefix:	meip_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319

Name:	us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.