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Related Party Transactions - Additional Information (Detail) (USD $)
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1 Months Ended |
6 Months Ended |
12 Months Ended |
25 Months Ended |
31 Months Ended |
91 Months Ended |
1 Months Ended |
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Nov. 30, 2010
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Mar. 31, 2015
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Mar. 31, 2014
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Sep. 30, 2014
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Sep. 30, 2013
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Feb. 28, 2011
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Dec. 31, 2008
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Sep. 30, 2013
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Feb. 28, 2009
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Apr. 20, 2013
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Jan. 31, 2013
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Sep. 30, 2012
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| Related Party Transaction [Line Items] |
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| Proceeds from convertible debt |
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$ 750,000us-gaap_ProceedsFromConvertibleDebt
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$ 0us-gaap_ProceedsFromConvertibleDebt
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$ 0us-gaap_ProceedsFromConvertibleDebt
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$ 250,000us-gaap_ProceedsFromConvertibleDebt
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| Convertible preferred stock, value, upon closing of preferred equity financing |
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1,000,000arth_ConvertiblePreferredStockValueUponClosingOfPreferredEquityFinancing
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| Percentage of conversion price of convertible preferred stock |
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20.00%arth_PercentageOfConversionPriceOfConvertiblePreferredStock
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| Current maturities of convertible notes payable, related parties |
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105,000arth_ConvertibleNotesPayableRelatedPartiesCurrent
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| Convertible notes, total aggregate principal balance |
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1,880,000us-gaap_DebtInstrumentCarryingAmount
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| Cash bonus |
500,000arth_CashBonus
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| Debt instrument, convertible, threshold amount |
1,000,000arth_DebtInstrumentConvertibleThresholdAmount
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| Convertible preferred stock value upon closing |
100,000arth_ConvertiblePreferredStockValueUponClosing
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| Related Parties |
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| Related Party Transaction [Line Items] |
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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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| Terrence Norchi [Member] |
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| Related Party Transaction [Line Items] |
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| Proceeds from convertible debt |
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$ 275,200us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arth_TerrenceNorchiMember
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$ 105,000us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arth_TerrenceNorchiMember
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| Percentage of principle balance of notes on conversion price of notes |
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20.00%arth_PercentageOfPrincipleBalanceOfNotesOnConversionPriceOfNotes
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arth_TerrenceNorchiMember
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| Debt instrument, maturity date |
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Aug. 10, 2010
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| Maximum |
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| Related Party Transaction [Line Items] |
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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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| Minimum |
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| Related Party Transaction [Line Items] |
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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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| Accrued Interest Through December Thirty One Two Thousand And Nine |
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| Related Party Transaction [Line Items] |
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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_DebtInstrumentAxis
= arth_AccruedInterestThroughDecemberThirtyOneTwoThousandAndNineMember
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| Accrued Interest Beginning January One Two Thousand And Ten | Terrence Norchi [Member] |
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| Related Party Transaction [Line Items] |
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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_DebtInstrumentAxis
= arth_CcruedInterestBeginningJanuaryOneTwoThousandAndTenMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arth_TerrenceNorchiMember
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