Leases - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) Suite	Jun. 30, 2020 USD ($) Suite	Mar. 31, 2020 Suite	Dec. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Right of use assets	$ 74,197	$ 74,197		$ 37,933
Catalent, Inc [Member] | Catalent Agreements [Member]
Lessee Lease Description [Line Items]
Number of dedicated clean room suites | Suite			4
Discount rate	8.00%	8.00%
Weighted average remaining lease term	4 years 6 months	4 years 6 months
Operating lease, term of agreement	5 years	5 years
Catalent, Inc [Member] | Catalent Agreements [Member] | Other Assets [Member]
Lessee Lease Description [Line Items]
Number of dedicated clean room suites | Suite	2	2
Clean room suite reservation fees payments	$ 18,000	$ 18,000
Thermo Fisher Scientific Inc. [Member] | Thermo Agreements [Member]
Lessee Lease Description [Line Items]
Number of dedicated clean room suites | Suite	8	8
Discount rate	7.50%	7.50%
Weighted average remaining lease term	7 years 4 months 24 days	7 years 4 months 24 days
Operating lease, term of agreement	8 years	8 years
Thermo Fisher Scientific Inc. [Member] | Thermo Agreements [Member] | Other Assets [Member]
Lessee Lease Description [Line Items]
Number of dedicated clean room suites | Suite	4	4
Clean room suite reservation fees payments	$ 43,100	$ 43,100
Catalent, Inc and Thermo Fisher Scientific Inc. [Member] | Catalent Agreements and Thermo Agreements [Member]
Lessee Lease Description [Line Items]
Right of use assets	39,800	39,800
Operating lease liability	35,500	35,500
Operating lease, cost	2,000	2,800
Variable lease, cost	$ 3,600	$ 4,500