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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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