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Segment Reporting - Schedule of Segment Expenses, Other Segment Items, and Segment Net Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	$ 30,914	$ 18,873
General and administrative expense	9,138	7,989
Other income, net	188	3
Condensed consolidated net loss	(39,282)	(24,303)
Operating segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other segment items	8,467	4,644
Other income, net	(770)	(2,559)
Condensed consolidated net loss	(39,282)	(24,303)
Operating segment [Member] | SGT-003 [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	9,166	1,906
Operating segment [Member] | SGT-501 [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	4,466	3,807
Operating segment [Member] | External Research and Development Other [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense, other	2,770	2,728
Operating segment [Member] | Internal Research and Development Expense [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	6,843	5,377
Operating segment [Member] | External General and Administrative Expense [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expense	4,877	5,434
Operating segment [Member] | Internal General and Administrative Expense [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expense	$ 3,463	$ 2,966

X

- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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