Leases - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 Suite	Dec. 31, 2020 USD ($)	Jun. 30, 2020 Suite
Lessee Lease Description [Line Items]
Right of use assets		$ 72,663		$ 91,761
Research and Development Expense [Member]
Lessee Lease Description [Line Items]
Derecognition of right of use asset	$ 22,800
Derecognition of lease liabilities	20,000
Recognition of loss	$ 2,800
Thermo Fisher Scientific Inc. [Member] | Thermo Agreements [Member]
Lessee Lease Description [Line Items]
Number of dedicated clean room suite | Suite			8		8
Right of use assets		13,300
Operating Lease Liability		$ 11,100
Thermo Fisher Scientific Inc. [Member] | Thermo Agreements [Member] | Other Assets [Member]
Lessee Lease Description [Line Items]
Number of dedicated clean room suite | Suite			4		4