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Leases - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) ft²	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) ft²	Sep. 30, 2024 USD ($)	Aug. 01, 2025 USD ($)	Dec. 31, 2024 USD ($)
Leases
Aggregate base rent	$ 159,823		$ 159,823
Operating lease ROU assets	80,682		80,682			$ 56,685
Operating lease ROU liability	107,298		107,298
Finance lease liabilities- current	2,676		2,676			3,000
Finance lease liabilities- noncurrent	13,833		13,833			15,574
Operating lease, expense	5,500	$ 5,900	15,700	$ 19,500
MassBio
Leases
Finance lease liabilities- current	2,700		2,700			3,000
Finance lease liabilities- noncurrent	13,800		13,800			$ 15,600
Finance lease cost	$ 300	$ 400	$ 900	$ 1,000
Minimum
Leases
Operating lease, term of contract	7 months 6 days		7 months 6 days
Maximum
Leases
Operating lease, term of contract	13 years 8 months 12 days		13 years 8 months 12 days
Renewal term	15 years		15 years
Warren Building under lease amendment
Leases
Area of real estate property | ft²	180,000		180,000
Mountainview
Leases
Operating lease, term of contract					12 years 9 months
Aggregate base rent					$ 42,600
Operating lease ROU assets					26,800
Operating lease ROU liability					$ 26,700

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