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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2023 USD ($) ft²	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2021 ft²	Oct. 01, 2021 USD ($)	Feb. 01, 2021 USD ($)	Jan. 31, 2021 USD ($) ft²	Jan. 29, 2021 USD ($)
Commitments And Contingencies [Line Items]
Lease agreement, extendable lease term							5 years
Operating lease, payments				$ 7.3	$ 10.1	$ 6.9
Operating lease, expense				$ 9.4	$ 11.0	$ 10.8
Operating lease, weighted average remaining lease term	6 years 1 month 6 days			6 years 1 month 6 days
Operating lease, weighted average discount rate, percent	5.60%			5.60%
Impairment losses of right-of-use assets	$ 0.1	$ 17.6	$ 11.2	$ 28.9
License obligations	0.6			0.6
Lonza Netherlands, B.V.
Commitments And Contingencies [Line Items]
Contractual obligation	$ 5.2			$ 5.2
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										5,000
Lessee operating lease, lease not yet commenced amount								$ 9.1	$ 0.7	$ 0.9
Reimbursement, tenant improvement allowance								$ 2.6
Richmond, California | November 2021 through August 2031
Commitments And Contingencies [Line Items]
Area of space leased (in sqft) | ft²							7,997
Valbonne, France
Commitments And Contingencies [Line Items]
Lease not yet commenced, area of real estate | ft²										5,800
Lessee, operating lease, amount										$ 0.8	$ 0.6
Office and Laboratory | Richmond, California | Expires in August 2031
Commitments And Contingencies [Line Items]
Area of space leased (in sqft) | ft²	59,485			59,485
Office and Laboratory | Richmond, California | Expires in August 2026
Commitments And Contingencies [Line Items]
Area of space leased (in sqft) | ft²	7,700			7,700
Office and Laboratory | Brisbane, California
Commitments And Contingencies [Line Items]
Area of space leased (in sqft) | ft²	103,089			103,089
Research and Office Space | Valbonne, France
Commitments And Contingencies [Line Items]
Area of space leased (in sqft) | ft²	28,048			28,048

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