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Nature of the Business - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2012
Organization Consolidated and Presentation [Line Items] |
Entity Incorporation, Date Of Incorporation | Dec. 05, 1989

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- Definition Date when an entity was incorporated + References No definition available. + Details
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Namespace Prefix: | dei_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | med_OrganizationConsolidatedAndPresentationLineItems
Namespace Prefix: | med_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration