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Consolidated Statements of Operations (USD $)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Revenues $ 0us-gaap_Revenues $ 0us-gaap_Revenues
Operating expenses:    
General and administrative expenses 870,355us-gaap_GeneralAndAdministrativeExpense 523,443us-gaap_GeneralAndAdministrativeExpense
Research and development expenses 399,735us-gaap_ResearchAndDevelopmentExpense 257,233us-gaap_ResearchAndDevelopmentExpense
Total operating expenses 1,270,090us-gaap_OperatingExpenses 780,676us-gaap_OperatingExpenses
Operating loss (1,270,090)us-gaap_OperatingIncomeLoss (780,676)us-gaap_OperatingIncomeLoss
Other income (expense):    
Interest expense (27,765)us-gaap_InterestExpense (27,765)us-gaap_InterestExpense
Gain on exercise of warrants 224,000arth_GainOnExerciseOfWarrants 0arth_GainOnExerciseOfWarrants
Loss on warrant derivative modification (1,300,170)us-gaap_DerivativeLossOnDerivative 0us-gaap_DerivativeLossOnDerivative
Adjustment to fair value of derivative 2,753,170us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Total other income (expense) 1,649,235us-gaap_OtherNoncashIncomeExpense (27,765)us-gaap_OtherNoncashIncomeExpense
Net Income (Loss) $ 379,145us-gaap_NetIncomeLoss $ (808,441)us-gaap_NetIncomeLoss
Basic earnings per share    
Net Income (Loss) per Share $ 0.01us-gaap_EarningsPerShareBasic $ (0.01)us-gaap_EarningsPerShareBasic
Weighted Common Shares - Basic and Diluted 73,337,085us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 60,145,237us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted earnings per share    
Net Income (Loss) per Share $ 0.01us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted
Weighted Common Shares - Diluted 73,422,007us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 60,145,237us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding