XML 26 R16.htm IDEA: XBRL DOCUMENT v3.6.0.2

The Company - Additional Information (Detail) $ in Millions	6 Months Ended
	Dec. 31, 2016 USD ($)
Clinical Trials
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Reduction of expenses	$ (1.9)

X

- Definition

Increase Decrease In Operating Expenses

+ References

No definition available.

+ Details

Name:	meip_IncreaseDecreaseInOperatingExpenses
Namespace Prefix:	meip_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]

+ References

No definition available.

+ Details

Name:	meip_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems
Namespace Prefix:	meip_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=meip_ClinicalTrialsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: