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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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