Commitments and Contingencies - Additional Information (Detail)	1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 31, 2018 USD ($) ft²	Mar. 31, 2017 ft²	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Commitment And Contingencies [Line Items]
Facility size | ft²	164,150	67,185
Initial term		10 years
Future minimum rental payments under the Lease term	$ 121,500,000
Operating lease term	10 years
Operating lease term, optional extension	10 years
Repayment of tenant inducement allowance	$ 4,100,000
Contingency losses					$ 0
Provisions for loss contingency					0
Operating Lease Cost			$ 2,400,000	$ 3,100,000	5,600,000	$ 6,200,000
variable lease cost			1,200,000	600,000	2,000,000.0	1,300,000
Acceleration of depreciation expenses			$ 0		$ 0
Maximum [Member]
Commitment And Contingencies [Line Items]
Operating lease remaining lease term					10 years
Minimum [Member]
Commitment And Contingencies [Line Items]
Operating lease remaining lease term					1 year
Leasehold Improvements [Member]
Commitment And Contingencies [Line Items]
Property palnt and equipment additions					$ 32,300,000
Depreciation expense				$ 1,900,000		$ 3,800,000
Lease Agreements [Member] | Maximum [Member]
Commitment And Contingencies [Line Items]
Tenant inducement	$ 27,900,000