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Convertible Notes Payable - Additional Information (Detail) (USD $)
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0 Months Ended |
12 Months Ended |
25 Months Ended |
31 Months Ended |
83 Months Ended |
91 Months Ended |
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Jun. 05, 2011
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Sep. 30, 2014
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Sep. 30, 2013
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Feb. 28, 2011
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Dec. 31, 2008
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Jan. 31, 2013
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Sep. 30, 2013
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Apr. 20, 2013
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Mar. 31, 2013
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Oct. 31, 2012
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Sep. 30, 2012
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| Short-term Debt [Line Items] |
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| Proceeds from convertible debt |
$ 250,000us-gaap_ProceedsFromConvertibleDebt
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$ 0us-gaap_ProceedsFromConvertibleDebt
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$ 250,000us-gaap_ProceedsFromConvertibleDebt
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$ 275,200us-gaap_ProceedsFromConvertibleDebt
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$ 105,000us-gaap_ProceedsFromConvertibleDebt
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$ 1,735,000us-gaap_ProceedsFromConvertibleDebt
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| Debt instrument, interest rate, stated percentage |
6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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| Convertible preferred stock, value, upon closing of preferred equity financing |
750,000arth_ConvertiblePreferredStockValueUponClosingOfPreferredEquityFinancing
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1,000,000arth_ConvertiblePreferredStockValueUponClosingOfPreferredEquityFinancing
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| Convertible notes, total aggregate principal balance |
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1,880,000us-gaap_DebtInstrumentCarryingAmount
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| Matured Convertible Notes |
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50,000arth_MaturedConvertibleNotes
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1,245,000arth_MaturedConvertibleNotes
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| Percentage of principle balance of notes on conversion price of notes |
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20.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
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| Convertible Notes Payable Related Parties Current |
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105,000arth_ConvertibleNotesPayableRelatedPartiesCurrent
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1,345,000arth_ConvertibleNotesPayableRelatedPartiesCurrent
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| Related Parties [Member] |
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| Short-term Debt [Line Items] |
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| Convertible notes, total aggregate principal balance |
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1,880,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arth_RelatedPartiesMember
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| Matured Convertible Notes |
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$ 50,000arth_MaturedConvertibleNotes
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arth_RelatedPartiesMember
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$ 55,000arth_MaturedConvertibleNotes
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arth_RelatedPartiesMember
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| Minimum |
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| Short-term Debt [Line Items] |
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| Debt instrument, interest rate, stated percentage |
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0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Percentage of principle balance of notes on conversion price of notes |
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6.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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10.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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10.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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10.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Maximum |
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| Short-term Debt [Line Items] |
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| Debt instrument, interest rate, stated percentage |
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0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Percentage of principle balance of notes on conversion price of notes |
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10.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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50.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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50.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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