Quarterly report pursuant to Section 13 or 15(d)

PRIVATE PLACEMENT FINANCING - Additional Information (Detail)

v2.4.1.9
PRIVATE PLACEMENT FINANCING - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended
Dec. 02, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jan. 30, 2014
Dec. 01, 2014
Mar. 13, 2015
Sep. 30, 2014
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Common Stock   $ 76,076us-gaap_CommonStockValue   $ 76,076us-gaap_CommonStockValue         $ 72,051us-gaap_CommonStockValue
Common Stock, Shares Issued   76,076,487us-gaap_CommonStockSharesIssued   76,076,487us-gaap_CommonStockSharesIssued         72,076,487us-gaap_CommonStockSharesIssued
Common Stock, Par or Stated Value Per Share   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare         $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Derivative, Fair Value, Net, Total   10,391,693us-gaap_DerivativeFairValueOfDerivativeNet   10,391,693us-gaap_DerivativeFairValueOfDerivativeNet          
Proceeds from Issuance of Private Placement       2,850,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement          
Fair Value Of Derivative Liabilities In Excess Of Proceeds   0arth_FairValueOfDerivativeLiabilitiesInExcessOfProceeds (7,541,693)arth_FairValueOfDerivativeLiabilitiesInExcessOfProceeds 0arth_FairValueOfDerivativeLiabilitiesInExcessOfProceeds (7,541,693)arth_FairValueOfDerivativeLiabilitiesInExcessOfProceeds        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)   1,096,278us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease 484,875us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease 3,849,448us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease 484,875us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease        
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   4,213,595us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue   4,213,595us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue         6,270,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised          
Gain On Warrant Derivative Modification   624,016arth_GainOnWarrantDerivativeModification   1,924,186arth_GainOnWarrantDerivativeModification          
Gain On Exercise Of Warrants   0arth_GainOnExerciseOfWarrants 0arth_GainOnExerciseOfWarrants 224,000arth_GainOnExerciseOfWarrants 0arth_GainOnExerciseOfWarrants        
Gains (Losses) on Extinguishment of Debt 224,000us-gaap_GainsLossesOnExtinguishmentOfDebt                
Private Placement                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Stock issued during period, shares, new issues           11,400,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Share price           $ 0.25us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Common Stock Issuance Upon Exercise Of Warrants           34,200,000arth_CommonStockIssuanceUponExerciseOfWarrants
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Proceeds from issuance of common stock           2,850,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Common Stock   11,400us-gaap_CommonStockValue
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
  11,400us-gaap_CommonStockValue
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
         
Common Stock, Shares Issued   11,400,000us-gaap_CommonStockSharesIssued
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
  11,400,000us-gaap_CommonStockSharesIssued
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
         
Common Stock, Par or Stated Value Per Share   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
  $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
         
Series A Warrants                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.30us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesWarrantsMember
  $ 0.30us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesWarrantsMember
         
Reduction In Exercise Price Of Warrants               $ 0.20arth_ReductionInExercisePriceOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesWarrantsMember
 
Additional Warrants Issued               5,700,000arth_AdditionalWarrantsIssued
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesWarrantsMember
 
Series A Warrants | Minimum [Member]                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Class of Warrant or Right, Outstanding               11,400,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesWarrantsMember
 
Series A Warrants | Maximum [Member]                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Class of Warrant or Right, Outstanding               17,100,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesWarrantsMember
 
Series A Warrants | After Issuance                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Exercise Term Of Warrants       5 years          
Series B Warrants                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Proceeds from issuance of common stock 800,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
               
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.35us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
  $ 0.35us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
         
Common Stock, Shares Issued 4,000,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
               
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       4,000,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
         
Class of Warrant or Right, Outstanding   4,000,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
  4,000,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
         
Gain On Warrant Derivative Modification             1,300,170arth_GainOnWarrantDerivativeModification
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
   
Series B Warrants | Minimum [Member]                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 0.20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
   
Series B Warrants | Maximum [Member]                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 0.35us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesBWarrantsMember
   
Series B Warrants | After Issuance                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Exercise Term Of Warrants       12 months          
Series B Warrants | Resale Registration Statement [Member]                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Exercise Term Of Warrants       6 months          
Series C Warrants                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.40us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesCWarrantsMember
  $ 0.40us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesCWarrantsMember
         
Percentage Of Exercisability Of Warrants       4.90%arth_PercentageOfExercisabilityOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesCWarrantsMember
         
Exercise Term Of Warrants       18 months          
Series C Warrants | Minimum [Member]                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 0.20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesCWarrantsMember
   
Series C Warrants | Maximum [Member]                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 0.40us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementEquityComponentsAxis
= arth_SeriesCWarrantsMember
   
Series C Warrants | After Issuance                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Exercise Term Of Warrants       18 months          
Series C Warrants | Resale Registration Statement [Member]                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Exercise Term Of Warrants       9 months          
Warrant                  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage               8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
 
Debt Instrument, Face Amount               750,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
 
Loss From Modification Of Warrant               $ 624,016arth_LossFromModificationOfWarrant
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember