Supplemental Disclosures - Schedules of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Payables and Accruals [Abstract]
Accrued personnel costs	$ 16,037	$ 17,418
Accrued external research and development expenses	8,412	10,229
Accrued external general and administrative expenses	1,880	1,301
Accrued royalties and sublicense fees	1,150	8,652
Accrued purchases of property and equipment	242	33
Other	1,890	757
Accrued expenses and other current liabilities	$ 29,611	$ 38,390

Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant