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Stockholders' Rights Plan - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015
Stockholders Rights Plan [Line Items]
Stockholders Rights Plan Expiration	Aug. 28, 2015

X

- Definition

Expiration date of stockholders rights plan.

+ References

No definition available.

+ Details

Name:	med_StockholdersRightsPlanExpiration
Namespace Prefix:	med_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	med_StockholdersRightsPlanLineItems
Namespace Prefix:	med_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration