Quarterly report pursuant to Section 13 or 15(d)

PRIVATE PLACEMENT FINANCING - Additional Information (Detail)

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		$ 0.001		$ 0.001					$ 0.001
Derivative, Fair Value, Net, Total		10,391,693		10,391,693
Proceeds from Issuance of Private Placement				2,850,000
Fair Value Of Derivative Liabilities In Excess Of Proceeds		0	(7,541,693)	0	(7,541,693)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)		1,096,278	484,875	3,849,448	484,875
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		4,213,595		4,213,595					6,270,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				0
Gain On Warrant Derivative Modification		624,016		1,924,186
Gain On Exercise Of Warrants		0arth_GainOnExerciseOfWarrants	0arth_GainOnExerciseOfWarrants	224,000arth_GainOnExerciseOfWarrants	0arth_GainOnExerciseOfWarrants
Gains (Losses) on Extinguishment of Debt	224,000
Private Placement
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Stock issued during period, shares, new issues						11,400,000
Share price						$ 0.25
Common Stock Issuance Upon Exercise Of Warrants						34,200,000
Proceeds from issuance of common stock						2,850,000
Common Stock		11,400		11,400
Common Stock, Shares Issued		11,400,000		11,400,000
Common Stock, Par or Stated Value Per Share		$ 0.001		$ 0.001
Series A Warrants
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.30		$ 0.30
Reduction In Exercise Price Of Warrants								$ 0.20
Additional Warrants Issued								5,700,000
Series A Warrants \| Minimum [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Class of Warrant or Right, Outstanding								11,400,000
Series A Warrants \| Maximum [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Class of Warrant or Right, Outstanding								17,100,000
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	800,000
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.35		$ 0.35
Common Stock, Shares Issued	4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				4,000,000
Class of Warrant or Right, Outstanding		4,000,000		4,000,000
Gain On Warrant Derivative Modification							1,300,170
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							$ 0.20
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							$ 0.35
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		$ 0.40		$ 0.40
Percentage Of Exercisability Of Warrants				4.90%
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							$ 0.20
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							$ 0.40
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%
Debt Instrument, Face Amount								750,000
Loss From Modification Of Warrant								$ 624,016