Quarterly report pursuant to Section 13 or 15(d)

8% CONVERTIBLE NOTES - Additional Information (Detail)

v2.4.1.9
8% CONVERTIBLE NOTES - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended
Mar. 13, 2015
Mar. 15, 2015
Mar. 31, 2015
Mar. 31, 2015
8% Convertible Notes [Line Items]        
Debt Instrument, Convertible, Conversion Price $ 0.20us-gaap_DebtInstrumentConvertibleConversionPrice1      
Maximum [Member]        
8% Convertible Notes [Line Items]        
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 9.99%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Minimum [Member]        
8% Convertible Notes [Line Items]        
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 4.99%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Subscription Agreement [Member]        
8% Convertible Notes [Line Items]        
Debt Instrument, Face Amount $ 750,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember
     
Debt Instrument, Interest Rate, Stated Percentage 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember
     
Debt Instrument, Maturity Date Mar. 13, 2016      
Debt Conversion, Description either (a) converted into shares of the Company’s common stock, $0.001 par value per share (“Common Stock”) or (b) the outstanding principal and accrued interest on the Notes is paid in full by the Company. Interest on the Notes becomes due and payable upon their conversion or the Stated Maturity Date and may become due and payable upon the occurrence of an event of default under the Notes. The Notes contain customary events of default, which include, among other things, (i) the Company’s failure to pay other indebtedness of $100,000 or more within the specified cure period for such breach; (iii) the acceleration of the stated maturity of such indebtedness; (iii) the insolvency of the Company; and (iv) the receipt of final, non-appealable judgments in the aggregate amount of $100,000 or more.      
Derivative Liability, Fair Value, Amount Not Offset Against Collateral   354,988us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember
262,131us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember
262,131us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember
Other Noncash Expense     92,857us-gaap_OtherNoncashExpense
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember
92,857us-gaap_OtherNoncashExpense
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember
Proceeds from Issuance of Debt   395,012us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember
   
Subscription Agreement [Member] | Investor [Member]        
8% Convertible Notes [Line Items]        
Debt Instrument, Face Amount $ 250,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_InvestorMember
/ us-gaap_ShortTermDebtTypeAxis
= arth_SubscriptionAgreementMember