Quarterly report pursuant to Section 13 or 15(d)

Estimated fair market value of the derivative liability (Detail)

v2.4.1.9
Estimated fair market value of the derivative liability (Detail) (Fair Value, Inputs, Level 3 [Member], Convertible Debt [Member], USD $)
6 Months Ended
Mar. 31, 2015
Fair Value, Inputs, Level 3 [Member] | Convertible Debt [Member]
 
Derivative [Line Items]  
Beginning balance at September 30, 2014 $ 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Issuances 354,988arth_DerivativeLiabilityIssuances
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Adjustments to estimated fair value (92,857)arth_DerivativeLiabilityAdjustments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Ending balance at March 31, 2015 $ 262,131us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember