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Stockholders' Equity (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Feb. 05, 2014
Jan. 31, 2014
Dec. 31, 2014
Nov. 30, 2014
Dec. 22, 2014
Dec. 31, 2013
Class of Stock [Line Items]            
Reverse stock split shares outstanding and authorized shares of common stock and preferred stock ratio
1 for 50
          
Common stock, shares authorized 300,000,000us-gaap_CommonStockSharesAuthorized   8,000,000us-gaap_CommonStockSharesAuthorized   8,000,000us-gaap_CommonStockSharesAuthorized 6,000,000us-gaap_CommonStockSharesAuthorized
Preferred stock, shares authorized 25,000,000us-gaap_PreferredStockSharesAuthorized   500,000us-gaap_PreferredStockSharesAuthorized     500,000us-gaap_PreferredStockSharesAuthorized
Common stock, shares issued     3,103,300us-gaap_CommonStockSharesIssued     2,227,447us-gaap_CommonStockSharesIssued
Purchase of series A common stock by warrants granted   315,676atth_PurchaseOfSeriesACommonStockByWarrantsGranted        
Purchase of series B common stock by warrants granted   157,846atth_PurchaseOfSeriesBCommonStockByWarrantsGranted        
Gross Proceeds     $ 15,900atth_GrossProceedsFromIssuanceOfPrivatePlacement      
Proceeds from issuance of common stock     6,234us-gaap_ProceedsFromIssuanceOfCommonStock      
Shares issued for private placement fee   355atth_SharesIssuedForPrivatePlacementFee        
Percentage of common stock issued for fee   7.50%atth_PercentageOfCommonStockIssuedForFee        
Private placement offering, net of issuance cost             
Additional share issued   631,346us-gaap_StockIssuedDuringPeriodSharesNewIssues        
February 25, 2011 [Member]            
Class of Stock [Line Items]            
Common stock, shares issued     95,334us-gaap_CommonStockSharesIssued
/ us-gaap_SubsidiarySaleOfStockAxis
= atth_DateMember		      
Proceeds from issuance of common stock     1,430us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= atth_DateMember		      
Private placement offering, net of issuance cost   4,663us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_SubsidiarySaleOfStockAxis
= atth_DateMember		        
Additional share issued   47,351us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= atth_DateMember		        
Public Offering [Member]            
Class of Stock [Line Items]            
Common stock, description      
(i) one share of our common stock; (ii) one Series C common stock warrant to purchase 0.75 shares of our common stock; (iii) one Series D common stock warrant to purchase one share of our common stock; and, (iv) one Series E common stock warrant to purchase 0.75 shares of our common stock, at a public offering price of $9.37 per unit
    
Additional share issued       193,865us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		    
January 27, 2014 [Member]            
Class of Stock [Line Items]            
Common stock, shares issued     631,346us-gaap_CommonStockSharesIssued
/ us-gaap_SubsidiarySaleOfStockAxis
= atth_DateFourteenMember		      
Proceeds from issuance of common stock     4,735us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= atth_DateFourteenMember		      
November 19, 2014 [Member]            
Class of Stock [Line Items]            
Common stock, shares issued     193,865us-gaap_CommonStockSharesIssued
/ us-gaap_SubsidiarySaleOfStockAxis
= atth_DateFifteenMember		      
Proceeds from issuance of common stock     1,816us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= atth_DateFifteenMember		      
Maximum [Member]            
Class of Stock [Line Items]            
Common stock price, per share       14.06us-gaap_SaleOfStockPricePerShare
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Common Stock [Member]            
Class of Stock [Line Items]            
Proceeds from issuance of common stock     1us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Private placement offering, net of issuance cost     $ 1,571us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Additional share issued     825,211us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Series B Warrants [Member]            
Class of Stock [Line Items]            
Term of warrants   5 years        
Warrants exercise price   $ 45.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= atth_SeriesBWarrantsMember		        
Series A Warrants [Member]            
Class of Stock [Line Items]            
Term of warrants   3 years        
Warrants exercise price   $ 15.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= atth_SeriesAWarrantsMember		        
Series C Warrants [Member] | Public Offering [Member]            
Class of Stock [Line Items]            
Warrants exercise price       12.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= atth_SeriesCWarrantsMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		    
Series D Warrants [Member] | Public Offering [Member]            
Class of Stock [Line Items]            
Warrants exercise price       9.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= atth_SeriesDWarrantsMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		    
Common stock price, per share       12.00us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementEquityComponentsAxis
= atth_SeriesDWarrantsMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		    
Warrants expiration, description      
Each Series D warrant has an exercise price of $9.37 per share, is immediately exercisable and separately transferable from the shares, may be redeemed by us in the event that the closing price of our stock is $12.00 or above for 20 consecutive trading days
    
Series E Warrants [Member] | Public Offering [Member]            
Class of Stock [Line Items]            
Warrants exercise price       15.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= atth_SeriesEWarrantsMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		    
Warrants expiration, description       Each Series E warrant is exercisable only if the Series D warrants are exercised, has an exercise price of $15.00 per share, is exercisable subsequent to the six month anniversary of the date of issuance and separately transferable from the shares and expire on the 90-month anniversary of the date of issuance.    
Percentage of gross proceeds from investors       3.50%atth_PercentageOfGrossProceedsFromInvestor
/ us-gaap_StatementEquityComponentsAxis
= atth_SeriesEWarrantsMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		    
Percentage of placement fee       7.00%atth_PercentageOfPlacementFee
/ us-gaap_StatementEquityComponentsAxis
= atth_SeriesEWarrantsMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember