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 2 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended
Dec. 02, 2014
Apr. 19, 2013
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Jan. 30, 2014
Dec. 01, 2014
Sep. 30, 2014
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1            
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   2,000,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement   2,850,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement        
Fair Value Of Derivative Liabilities In Excess Of Proceeds       7,541,693arth_FairValueOfDerivativeLiabilitiesInExcessOfProceeds        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)       2,753,170us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value     4,593,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue 4,593,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised        
Derivative Liability         0us-gaap_DerivativeLiabilities      
Gain On Warrant Derivative Modification     1,300,170arth_GainOnWarrantDerivativeModification (1,300,170)arth_GainOnWarrantDerivativeModification 0arth_GainOnWarrantDerivativeModification      
Gain On Exercise Of Warrants     224,000arth_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
       
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 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
       
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