Organization (Details Textual)	12 Months Ended
Dec. 31, 2025
Organization And Significant Accounting Policies [Line Items]
COVID vaccination age limit	adults 18 years and older

Organization and significant accounting policies line items.

No definition available.

Name:	arct_OrganizationAndSignificantAccountingPoliciesLineItems
Namespace Prefix:	arct_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration