RESTRUCTURING - Schedule of Restructuring Liabilities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Restructuring Reserve [Roll Forward]
Restructuring liabilities - beginning of period	$ 17,567,000	$ 1,705,000	$ 54,000	$ 0
Restructuring charges excluding non-cash items	76,000	518,000	21,784,000	25,989,000
Cash payments	(16,405,000)	(1,846,000)	(20,600,000)	(25,612,000)
Restructuring liabilities - end of period	1,238,000	377,000	1,238,000	377,000
Stock-based compensation expense reversal	(88,094,000)	$ (68,237,000)	(208,803,000)	(193,432,000)
2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Restructuring liabilities - end of period	1,200,000		1,200,000
Non-cash items, net			1,500,000
Accelerated stock-based compensation expense			3,200,000
2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Restructuring liabilities - beginning of period			0
Restructuring liabilities - end of period	$ 0		0
Non-cash items, net				1,400,000
Accelerated stock-based compensation expense				3,400,000
Unvested Restricted Stock Award | 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Stock-based compensation expense reversal			$ 4,700,000
Unvested Restricted Stock Award | 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Stock-based compensation expense reversal				$ 4,800,000