STOCK INCENTIVE PLANS - Stock Option Roll-forward (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Shares
Beginning balance (in shares)	5,902,591
Options exercised (in shares)	(42,304)
Options cancelled/forfeited/expired (in shares)	(102,781)
Ending balance (in shares)	5,757,506	5,902,591
Options exercisable (in shares)	5,706,466
Weighted average exercise price per share
Beginning balance (in dollars per share)	$ 1.68
Options exercised (in dollars per share)	0.91
Options cancelled/forfeited/expired (in dollars per share)	2.87
Ending balance (in dollars per share)	1.66	$ 1.68
Options exercisable (in dollars per share)	$ 1.64
Weighted average remaining contractual life, options outstanding (in years)	3 years 7 months 17 days	4 years 10 days
Weighted average remaining contractual life, options exercisable (in years)	3 years 7 months 9 days