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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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