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Segment Reporting - Schedule of Segment Expenses, Other Segment Items, and Segment Net Loss (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Research and development expense	$ 44,265		$ 32,415		$ 90,405	$ 63,329
General and administrative expense	13,119		9,278		24,287	18,416
Other income, net	214		207		371	395
Condensed consolidated net loss	(54,799)	$ (56,737)	(39,480)	$ (39,282)	(111,536)	(78,762)
Operating segment [Member]
Segment Reporting [Line Items]
Other segment items	7,497		7,586		15,798	15,228
Other income, net	(2,585)		(2,213)		(3,156)	(2,983)
Condensed consolidated net loss	(54,799)		(39,480)		(111,536)	(78,762)
Operating segment [Member] \| SGT-003 [Member]
Segment Reporting [Line Items]
Research and development expense	24,516		12,219		47,458	21,385
Operating segment [Member] \| SGT-501 [Member]
Segment Reporting [Line Items]
Research and development expense	903		2,223		2,310	6,689
Operating segment [Member] \| SGT-212 [Member]
Segment Reporting [Line Items]
Research and development expense	2,364		1,145		5,680	1,970
Operating segment [Member] \| External Research and Development Other [Member]
Segment Reporting [Line Items]
Research and development expense, other	1,983		3,116		4,840	5,886
Operating segment [Member] \| Internal Research and Development Expense [Member]
Segment Reporting [Line Items]
Research and development expense	9,060		6,765		18,211	13,608
Operating segment [Member] \| External General and Administrative Expense [Member]
Segment Reporting [Line Items]
General and administrative expense	6,327		5,279		11,795	10,156
Operating segment [Member] \| Internal General and Administrative Expense [Member]
Segment Reporting [Line Items]
General and administrative expense	$ 4,734		$ 3,360		$ 8,600	$ 6,823