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COMMITMENTS - Additional Information (Detail) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) ft² | Mar. 31, 2020 USD ($) | Feb. 01, 2021 USD ($) | Jan. 31, 2021 USD ($) ft² | Jan. 29, 2021 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |
Operating lease costs | $ 2.7 | $ 2.6 |  |  |
Variable lease expense | 0.7 | 0.5 |  |  |
Cash paid for operating lease liabilities included net cash used in operating activities | $ 1.7 | $ 1.6 |  |  |
Operating lease, weighted-average remaining lease term | 7 years 6 months |  |  |  |
Operating lease, weighted-average discount rate | 6.20% |  |  |  |
License obligations | $ 0.9 |  |  |  |
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] |  |  |  |  |
Area of real estate | ft² |  |  |  | 5,000 |
Lease payment amount |  |  | $ 0.7 | $ 0.9 |
Valbonne, France |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Area of real estate | ft² |  |  |  | 5,800 |
Lease payment amount |  |  |  | $ 0.8 | $ 0.6
Office and laboratory | Brisbane, California |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Area of space leased (in sqft) | ft² | 87,700 |  |  |  |
Operating lease one | Office and laboratory | Richmond, California |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Area of space leased (in sqft) | ft² | 59,200 |  |  |  |
Operating lease one | Research and office space | Valbonne, France |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Area of space leased (in sqft) | ft² | 25,600 |  |  |  |

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