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Leases - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
ft²
Term
operating_lease
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
ft²
Term
operating_lease
Jun. 30, 2019
USD ($)
May 01, 2020
ft²
Dec. 31, 2019
ft²
Lessee, Lease, Description [Line Items]            
Number of operating leases | operating_lease 3   3      
Operating lease, expense $ 2,600 $ 1,100 $ 5,000 $ 2,100    
Renewal Term ( in years ) 10 years   10 years      
Aggregate rent, Initial term $ 37,504   $ 37,504      
2020 (excludes the six months ended June 30, 2020) 3,719   3,719      
2021 6,667   6,667      
2022 6,314   6,314      
Fixed lease cost 1,970 835 4,089 1,647    
Research and development $ 176,525 $ 59,979 $ 266,632 $ 112,544    
MassBio | Finance Lease            
Lessee, Lease, Description [Line Items]            
Lessee, Finance Lease, Term of Contract 12 years 6 months   12 years 6 months      
Research and development $ 41,200   $ 41,200      
Minimum            
Lessee, Lease, Description [Line Items]            
Term of Contract ( in years ) 3 months 18 days   3 months 18 days      
Maximum            
Lessee, Lease, Description [Line Items]            
Term of Contract ( in years ) 6 years 10 months 24 days   6 years 10 months 24 days      
New Building            
Lessee, Lease, Description [Line Items]            
Area of real estate property | ft² 75,000   75,000      
Renewal Term ( in years ) 5 years   5 years      
Hopewell Campus            
Lessee, Lease, Description [Line Items]            
Term of Contract ( in years ) 15 years   15 years      
Area of real estate property | ft² 220,500   220,500     185,000
Number of terms | Term 2   2      
Aggregate rent, Initial term $ 111,500   $ 111,500      
Percent of market rate 95.00%   95.00%      
Mountainview            
Lessee, Lease, Description [Line Items]            
2020 (excludes the six months ended June 30, 2020) $ 900   $ 900      
2021 1,800   1,800      
2022 $ 1,400   $ 1,400      
Bridgewater [Member]            
Lessee, Lease, Description [Line Items]            
Lease, Area | ft²         59,000