Leases - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2018 Suite	Mar. 31, 2020 USD ($) Suite	Dec. 31, 2019 USD ($)	Sep. 30, 2019 Suite
Lessee Lease Description [Line Items]
Right of use assets		$ 63,097	$ 37,933
Catalent Agreements [Member] | Catalent, Inc [Member]
Lessee Lease Description [Line Items]
Number of dedicated clean room suites | Suite	2	4
Number of additional clean room suites available on optional reserve | Suite	2			2
Agreement expiration date	Dec. 31, 2024
Right of use assets		$ 27,000
Operating lease liability		$ 24,300
Discount rate		8.00%
Weighted average remaining lease term		4 years 9 months 18 days
Operating lease, cost		$ 800
Variable lease, cost		$ 900
Operating lease, term of agreement		5 years
Catalent Agreements [Member] | Catalent, Inc [Member] | Other Assets [Member]
Lessee Lease Description [Line Items]
Number of dedicated clean room suites | Suite		2
Clean room suite reservation fees payments		$ 18,000
Thermo Agreements [Member] | Thermo Fisher Scientific Inc. [Member]
Lessee Lease Description [Line Items]
Cash payment under agreements		$ 86,300