UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Non-cash investing activities:
Reclass prepaid expenses from noncurrent to current	$ 107	$ 107

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