v3.26.1
Segment Reporting - Schedule of Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenue        
Collaboration and license revenue $ 1,051 $ 3,076 $ 2,033 $ 5,247
Operating expenses:        
Research and development 23,402 32,634 45,306 62,422
General and administrative 8,142 9,095 16,359 17,728
Depreciation expense     1,392 1,376
Other (expense) income:        
Interest and other income, net 833 2,390 1,995 5,192
Interest expense (699) (689) (1,388) (1,368)
Net loss (30,359) (36,952) (59,025) (71,079)
Reportable Segment        
Revenue        
Collaboration and license revenue 1,051 3,076 2,033 5,247
Other (expense) income:        
Interest and other income, net 833 2,390 1,995 5,192
Interest expense (699) (689) (1,388) (1,368)
Net loss (30,359) (36,952) (59,025) (71,079)
Reportable Segment | Location, Statement of Income, Balance [Axis]: us-gaap:Depreciation        
Operating expenses:        
Research and development 615 521 1,224 1,023
General and administrative 84 176 168 353
Reportable Segment | Location, Statement of Income, Balance [Axis]: tcrx:ClinicalStudies        
Operating expenses:        
Research and development 4,017 3,721 6,907 7,416
Reportable Segment | Location, Statement of Income, Balance [Axis]: tcrx:FacilityRelatedAndOther        
Operating expenses:        
Research and development 5,367 5,657 9,932 11,205
General and administrative 1,774 1,935 3,464 3,743
Reportable Segment | Location, Statement of Income, Balance [Axis]: tcrx:LaboratorySuppliesResearchMaterialsAndStudies        
Operating expenses:        
Research and development 5,297 12,101 9,575 21,590
Reportable Segment | Location, Statement of Income, Balance [Axis]: tcrx:LegalAndProfessionalFees        
Operating expenses:        
General and administrative 2,520 2,041 4,212 3,995
Reportable Segment | Location, Statement of Income, Balance [Axis]: tcrx:PersonnelExpenses        
Operating expenses:        
Research and development 6,909 8,966 15,240 17,782
General and administrative 2,604 3,337 6,121 6,356
Reportable Segment | Location, Statement of Income, Balance [Axis]: tcrx:StockBasedCompensation        
Operating expenses:        
Research and development 1,197 1,668 2,428 3,406
General and administrative $ 1,160 $ 1,606 $ 2,394 $ 3,281