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Leases - Narrative (Details) $ in Thousands		12 Months Ended
	Jun. 19, 2020	Dec. 31, 2020 USD ($) ft² lease	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jul. 01, 2020 USD ($) ft² item	May 01, 2020 ft²
Leases
Number of operating leases | lease		3
Operating lease, expense		$ 15,300	$ 6,000	$ 2,700
Renewal Term		10 years
Aggregate rent, Initial term		$ 144,075
2021		13,721
2022		13,301
Fixed lease cost		12,368	4,929
Research and development		477,643	$ 257,452	$ 171,984
MassBio
Leases
Finance lease expense		900
Written notice required for early lease termination	24 months
Finance lease, term of contract	12 years 6 months
Research and development		$ 41,400
Minimum
Leases
Operating lease, term of contract		1 month 6 days
Maximum
Leases
Operating lease, term of contract		14 years 6 months
New Building | Minimum
Leases
Area of real estate property | ft²		75,000
Hopewell Campus
Leases
Operating lease, term of contract					15 years
Area of real estate property | ft²					220,500
Renewal Term					10 years
Number of renewable terms | item					2
Aggregate rent, Initial term					$ 111,500
Percent of market rate					95.00%
Mountainview
Leases
2021		$ 1,800
2022		1,400
Thereafter		$ 0
Bridgewater
Leases
Area of real estate property | ft²						59,000

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease due after second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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