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RESTRUCTURING CHARGES - Narrative (Details)		3 Months Ended	9 Months Ended
	Apr. 26, 2023 employee	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 5,337,000
April 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated in restructuring | employee	110
Percentage of positions eliminated in restructuring	23.00%
Restructuring charges		$ 0	5,300,000
Research and development | April 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4,100,000
General and administrative | April 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 1,200,000
Full-Time Employees | April 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated in restructuring | employee	55
Contracted Employees | April 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated in restructuring | employee	55

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