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Leases - Narrative (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Jun. 19, 2020	Mar. 31, 2021 USD ($) ft² item lease	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	May 01, 2020 ft²
Leases
Number of operating leases | lease		3
Operating lease, expense		$ 5,400	$ 2,400
Aggregate rent, Initial term		140,469
2021 (excludes the three months ended March 31, 2021)		10,242
2022		13,240
Research and development		134,513	$ 90,107
MassBio
Leases
Finance lease cost		$ 400
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		3 months 18 days
Maximum
Leases
Operating lease, term of contract		14 years 3 months 18 days
Renewal Term		10 years
New Building
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 (excludes the three months ended March 31, 2021)		$ 1,400
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 first 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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Required period of written notification to lessor prior to early termination required by terms of the lease agreement.

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Area of a real estate property.

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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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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next 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 operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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