v3.26.1
REVENUE AND GRANT INCOME RECOGNITION - Schedule of Balances Recorded within Deferred Revenue (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Disaggregation of Revenue [Line Items]    
Deferred revenue [1] $ 33,540 $ 15,285
Location, Statement of Financial Position, Balance [Axis]: us-gaap:DeferredRevenueNoncurrent    
Disaggregation of Revenue [Line Items]    
Deferred revenue 12,800 12,800
Location, Statement of Financial Position, Balance [Axis]: xe:AccruedLiabilitiesAndDeferredRevenueCurrent    
Disaggregation of Revenue [Line Items]    
Deferred revenue 443 132
Related Party    
Disaggregation of Revenue [Line Items]    
Deferred revenue 2,770 0
Related Party | Location, Statement of Financial Position, Balance [Axis]: us-gaap:DeferredRevenueNoncurrent    
Disaggregation of Revenue [Line Items]    
Deferred revenue $ 17,527 $ 2,353
[1] During the three and six months ended June 30, 2026, no revenue was recognized that had previously been deferred. During the three and six months ended June 30, 2025, zero and $1.1 million, respectively, of revenue was recognized that had previously been deferred.