COMMITMENTS - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)	Feb. 01, 2021 USD ($)	Jan. 31, 2021 USD ($) ft²	Jan. 29, 2021 USD ($)
Commitments And Contingencies [Line Items]
Cash paid for operating lease liabilities included net cash used in operating activities | $	$ 5.2	$ 4.7
License obligations | $	$ 0.8
Richmond, California
Commitments And Contingencies [Line Items]
Area of real estate				5,000
Lease payment amount | $			$ 0.7	$ 0.9
Valbonne, France
Commitments And Contingencies [Line Items]
Area of real estate				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)	87,700
Operating lease one | Office and laboratory | Richmond, California
Commitments And Contingencies [Line Items]
Area of space leased (in sqft)	59,200
Operating lease one | Research and office space | Valbonne, France
Commitments And Contingencies [Line Items]
Area of space leased (in sqft)	25,600