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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Statutory federal income tax rate and the effective rate reconciliation    
Federal statutory rate, amount $ (1,770)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (1,449)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Sale of NJ NOL/credits, amount (495)atth_EffectiveIncomeTaxRateReconciliationSaleOfCreditAmount   
Permanent differences, amount 136us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 50us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Research and development, amount (110)us-gaap_IncomeTaxReconciliationTaxCreditsResearch   
State taxes, amount 1us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes   
Stock compensation (584)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost   
Valuation allowance 2,074us-gaap_IncomeTaxReconciliationDeductions 1,400us-gaap_IncomeTaxReconciliationDeductions
Effective tax rate, amount $ (748)us-gaap_IncomeTaxExpenseBenefit