Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Collaboration revenue	$ 875	$ 20,558
Total research and development expenses	33,054	32,074
General and administrative expenses	10,124	10,274
Interest and other income	2,624	4,441
Provision for (benefit from) income taxes	38	0
Net (loss) income	(39,717)	(17,349)
Reportable Segment
Segment Reporting Information [Line Items]
Collaboration revenue	875	20,558
Total research and development expenses	33,054	32,074
General and administrative expenses	10,124	10,274
Interest and other income	2,624	4,441
Provision for (benefit from) income taxes	38	0
Net (loss) income	(39,717)	(17,349)
Reportable Segment | ENTR-601-44
Segment Reporting Information [Line Items]
Total research and development expenses	4,755	4,734
Reportable Segment | ENTR-601-45
Segment Reporting Information [Line Items]
Total research and development expenses	3,602	2,859
Reportable Segment | ENTR-601-50
Segment Reporting Information [Line Items]
Total research and development expenses	1,369	692
Reportable Segment | ENTR-601-51
Segment Reporting Information [Line Items]
Total research and development expenses	2,337	826
Reportable Segment | DMD franchise-wide
Segment Reporting Information [Line Items]
Total research and development expenses	1,739	0
Reportable Segment | Collaboration services
Segment Reporting Information [Line Items]
Total research and development expenses	234	876
Reportable Segment | Ocular programs
Segment Reporting Information [Line Items]
Total research and development expenses	461	270
Reportable Segment | Other preclinical and discovery
Segment Reporting Information [Line Items]
Total research and development expenses	599	987
Reportable Segment | Personnel related (including stock-based compensation)
Segment Reporting Information [Line Items]
Total research and development expenses	12,041	12,756
Reportable Segment | Facility related and other
Segment Reporting Information [Line Items]
Total research and development expenses	$ 5,917	$ 8,074