STOCK BASED COMPENSATION - Activity in Unvested RSUs Granted to Employees and Non-Employees (Details) - Restricted Stock Units (RSUs) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Shares
Ending balance (in shares)	6,342,141
Employee
Number of Shares
Beginning balance (in shares)	1,931,187	0
Granted (in shares)	6,872,358	1,931,187
Vested (in shares)	(4,797,854)	0
Forfeited/canceled (in shares)	(52,942)	0
Ending balance (in shares)	3,952,749	1,931,187
Weighted- Average Grant-Date Fair Value
Beginning balance (in dollars per share)	$ 2.87	$ 0
Granted (in dollars per share)	0.43	2.87
Vested (in dollars per share)	0.72	0
Forfeited/canceled (in dollars per share)	1.70	0
Ending balance (in dollars per share)	$ 1.26	$ 2.87
Non-employee
Number of Shares
Beginning balance (in shares)	82,645	0
Granted (in shares)	2,870,564	134,669
Vested (in shares)	(372,972)	0
Forfeited/canceled (in shares)	(190,845)	(52,024)
Ending balance (in shares)	2,389,392	82,645
Weighted- Average Grant-Date Fair Value
Beginning balance (in dollars per share)	$ 1.21	$ 0
Granted (in dollars per share)	0.82	1.41
Vested (in dollars per share)	1.15	0
Forfeited/canceled (in dollars per share)	0.70	1.73
Ending balance (in dollars per share)	$ 0.79	$ 1.21