UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Non-cash investing activities:
Reclass prepaid expenses from noncurrent to current	$ 214	$ 214

Noncash, Reclassification Of Prepaid Expenses From Noncurrent To Current

No definition available.

Name:	xcur_NoncashReclassificationOfPrepaidExpensesFromNoncurrentToCurrent
Namespace Prefix:	xcur_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration