Name:	arth_ColdstreamFinancingLineItems
Namespace Prefix:	arth_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Proceeds from investors in contemplation of merger.

No definition available.

Name:	arth_ProceedsFromInvestorsInContemplationOfMerger
Namespace Prefix:	arth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Unit issued price per share.

No definition available.

Name:	arth_UnitIssuedPricePerShare
Namespace Prefix:	arth_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Warrants Issued To Purchase of common stock

No definition available.

Name:	arth_WarrantsIssuedToPurchaseOfCommonStock
Namespace Prefix:	arth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(4))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	arth_FinancingTypeAxis=arth_ColdstreamFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: