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Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 01, 2020 USD ($)	May 31, 2020 USD ($) ft²
Commitments And Contingencies [Line Items]
Operating lease, cost	$ 10.4
Variable lease, cost	2.3
Operating lease, payments	6.4
Operating lease, expense	$ 10.4	$ 7.9
Rent expenses			$ 2.3
Operating lease, weighted average remaining lease term	7 years 7 months 6 days
Operating lease, weighted average discount rate, percent	6.10%
License obligations	$ 1.0
Minimum
Commitments And Contingencies [Line Items]
Lease agreement, extendable lease term	5 years
Maximum
Commitments And Contingencies [Line Items]
Lease agreement, extendable lease term	10 years
Richmond, California
Commitments And Contingencies [Line Items]
Lease not yet commenced, area of real estate | ft²					8,500
Lessee Operating Lease Lease Not Yet Commenced Amount				$ 1.3	$ 1.6
Office And Laboratory | Brisbane, California
Commitments And Contingencies [Line Items]
Area of space leased (in sqft) | ft²	87,700
Office And Laboratory | Richmond, California
Commitments And Contingencies [Line Items]
Area of space leased (in sqft) | ft²	54,200
Research and Office Space | Valbonne, France
Commitments And Contingencies [Line Items]
Area of space leased (in sqft) | ft²	20,800

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