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Stockholders' Rights Plan - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2015
Stockholders Rights Plan [Line Items] |
Investment Warrants Expiration Date | Aug. 28, 2015

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- Definition Expiration date of warrants held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
Name: | invest_InvestmentWarrantsExpirationDate
Namespace Prefix: | invest_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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