FAIR VALUE MEASUREMENTS - Changes to Fair Value Measurement Level 3 (Details) - Liabilities - Level 3 - Fair Value, Recurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative liability, beginning balance	$ 101,615	$ 126,117
Exercise of warrants	(82,018)	(9,396)
Remeasurement to fair value	(6,716)	(15,106)
Conversion of redeemable convertible preferred stock	12,881
Derivative liability, ending balance	0	101,615
Series A Warrant Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative liability, beginning balance	0	11,291
Exercise of warrants	0	(9,396)
Remeasurement to fair value	0	(1,895)
Conversion of redeemable convertible preferred stock	0
Derivative liability, ending balance	0	0
Series A Embedded Derivative Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative liability, beginning balance	16,835	18,448
Exercise of warrants	0	0
Remeasurement to fair value	(3,954)	(1,613)
Conversion of redeemable convertible preferred stock	12,881
Derivative liability, ending balance	0	16,835
Series B Warrant Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative liability, beginning balance	84,780	96,378
Exercise of warrants	(82,018)	0
Remeasurement to fair value	(2,762)	(11,598)
Conversion of redeemable convertible preferred stock	0
Derivative liability, ending balance	$ 0	$ 84,780