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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |
Operating lease, cost |  | $ 7.9 |  |
Variable lease, cost |  | 1.9 |  |
Operating lease, payments |  | 3.5 |  |
Operating lease, expense |  | $ 7.9 |  |
Rent expenses |  |  | $ 2.3 | $ 1.1
Operating lease, weighted average remaining lease term |  | 8 years 9 months 18 days |  |
Operating lease, weighted average discount rate, percent |  | 6.20% |  |
License obligations |  | $ 1.2 |  |
Manufacturing Capacity |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Payment to secure manufacturing capacity |  | 3.0 |  |
Other commitment |  | 6.3 |  |
Manufacturing Obligations |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Payment to secure manufacturing capacity | $ 0.5 |  |  |
Other commitment |  | $ 2.0 |  |
Non-cancelable Contractual Commitment |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Contractual obligation, paid upon execution | $ 0.5 |  |  |
Minimum |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Lease agreement, extendable lease term |  | 5 years |  |
Minimum | Non-cancelable Contractual Commitment |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Contractual obligation |  | $ 2.5 |  |
Maximum |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Lease agreement, extendable lease term |  | 10 years |  |
Brisbane, California |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Area of space leased (in sqft) | ft² |  | 52,620 |  |
Lessee operating lease liability tenant improvement allowance |  | $ 6.8 |  |
Lessee operating lease, lease not yet commenced tenant improvement allowance |  | $ 10.2 |  |
Research and Office Space | Valbonne, France |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Area of space leased (in sqft) | ft² |  | 20,800 |  |
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 |  | 45,600 |  |
Office Space | Brisbane, California |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Area of space leased (in sqft) | ft² |  | 35,080 |  |

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- Definition Lessee Operating Lease, Lease Not Yet Commenced Tenant Improvement Allowance + References No definition available. + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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