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COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) ft² | Sep. 30, 2020 USD ($) ft² | May 31, 2020 USD ($) ft²
Commitments And Contingencies [Line Items] |  |  |
Operating lease costs | $ 4,000 | $ 7,700 |
Variable lease expense | $ 1,000 | 1,600 |
Cash paid for operating lease liabilities included net cash used in operating activities |  | $ 4,700 |
Operating lease, weighted-average remaining lease term | 8 years 1 month 6 days | 8 years 1 month 6 days |
Operating lease, weighted-average discount rate | 6.20% | 6.20% |
Contractual obligation | $ 24,313 | $ 24,313 |
License obligations | $ 1,900 | $ 1,900 |
Minimum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease agreement, extendable lease term | 5 years | 5 years |
Maximum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease agreement, extendable lease term | 10 years | 10 years |
Richmond, California |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease not yet commenced, area of real estate | ft² |  |  | 8,500
Lease not yet commenced, amount |  |  | $ 1,600
Office and Laboratory | Brisbane, California |  |  |
Commitments And Contingencies [Line Items] |  |  |
Area of space leased (in sqft) | ft² | 87,700 | 87,700 |
Operating Lease One | Office and Laboratory | Richmond, California |  |  |
Commitments And Contingencies [Line Items] |  |  |
Area of space leased (in sqft) | ft² | 45,600 | 45,600 |
Operating Lease One | Research and Office Space | Valbonne, France |  |  |
Commitments And Contingencies [Line Items] |  |  |
Area of space leased (in sqft) | ft² | 20,800 | 20,800 |

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