STOCK-BASED COMPENSATION - Summary of Options Outstanding and Weighted Average Exercise Price (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Number of Shares
Options outstanding, beginning balance (in shares)	15,124,546
Granted (in shares)	2,672,150
Exercised (in shares)	(76,908)
Forfeited or expired (in shares)	(363,211)
Options outstanding, ending balance (in shares)	17,356,577	15,124,546
Vested and exercisable, ending balance (in shares)	10,596,135
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share)	$ 3.87
Granted (in dollars per share)	3.68
Exercised (in dollars per share)	2.47
Forfeited or expired (in dollars per share)	7.55
Options outstanding, ending balance (in dollars per share)	3.77	$ 3.87
Vested and exercisable (in dollars per share)	$ 4.15
Weighted Average Remaining Contractual Life in Years and Aggregate Intrinsic Value
Weighted Average Remaining Contractual Life in Years, Options outstanding	7 years 10 days	6 years 10 months 24 days
Weighted Average Remaining Contractual Life in Years, Granted	9 years 11 months 1 day
Weighted Average Remaining Contractual Life in Years, Vested and exercisable	5 years 9 months 25 days
Aggregate intrinsic value, options outstanding	$ 3,850,510	$ 5,212,286
Aggregate intrinsic value, vested and exercisable	$ 2,370,416