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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, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Research and development expense | $ 32,415 |  | $ 19,461 |  | $ 63,329 | $ 38,334
General and administrative expense | 9,278 |  | 8,327 |  | 18,416 | 16,316
Other income, net | 207 |  | 239 |  | 395 | 242
Condensed consolidated net loss | (39,480) | $ (39,282) | (25,072) | $ (24,303) | (78,762) | (49,375)
Operating segment [Member] |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Other segment items | 8,731 |  | 6,680 |  | 17,198 | 11,324
Other income, net | (2,213) |  | (2,716) |  | (2,983) | (5,275)
Condensed consolidated net loss | (39,480) |  | (25,072) |  | (78,762) | (49,375)
Operating segment [Member] | SGT-003 [Member] |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Research and development expense | 12,219 |  | 2,434 |  | 21,385 | 4,340
Operating segment [Member] | SGT-501 [Member] |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Research and development expense | 2,223 |  | 3,422 |  | 6,689 | 7,229
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 | 3,116 |  | 1,845 |  | 5,886 | 4,573
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 | 6,765 |  | 4,921 |  | 13,608 | 10,298
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 | 5,279 |  | 5,449 |  | 10,156 | 10,883
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 | $ 3,360 |  | $ 3,037 |  | $ 6,823 | $ 6,003

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