Significant Agreements – Related Parties (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 24, 2020	Jul. 23, 2019	Sep. 30, 2021	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Research and development				$ 33,000	$ 15,900	$ 92,100	$ 43,700
Current liabilities				21,028		21,028		$ 17,990
Related Party
Related Party Transaction [Line Items]
Research and development				5,817	2,310	15,324	7,400
Accrued expenses and other current liabilities				1,285		1,285		0
Accounts payable				659		659		615
Master Services Agreement | Related Party
Related Party Transaction [Line Items]
Research and development				100	100	100	100
Accrued expenses and other current liabilities				0		0		0
BBL Agreements | Related Party
Related Party Transaction [Line Items]
Research and development				100	300	100	1,100
Accrued expenses and other current liabilities				100		100		0
Related party agreement, term (in years)		5 years
Syngene Agreement, Manufacturing | Related Party
Related Party Transaction [Line Items]
Related party agreement, term (in years)		6 years
Syngene Agreement, Master Contract Services | Related Party
Related Party Transaction [Line Items]
Related party agreement, term (in years)	2 years
Syngene Agreements | Related Party
Related Party Transaction [Line Items]
Research and development				5,700	$ 2,000	15,200	$ 6,300
Accrued expenses and other current liabilities				700		700		600
Current liabilities				1,900		1,900		600
Accounts payable				$ 1,200		$ 1,200		$ 0
Promissory Note | Chief Financial Officer
Related Party Transaction [Line Items]
Promissory note loan amount			$ 274
Interest rate			0.86%
Number of shares pledged as collateral (in shares)			616,320