STOCK-BASED COMPENSATION - Stock Option Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Number
Outstanding, beginning (in shares)	571,359
Granted (in shares)	0
Exercised (in shares)	0
Cancelled (in shares)	(127,576)
Forfeited (in shares)	(39)
Outstanding, ending (in shares)	443,744	571,359
Options exercisable (in shares)	427,922
Vested and expected to vest (in shares)	443,744
Weighted average exercise price
Outstanding, beginning (in dollars per share)	$ 9.47
Cancelled (in dollars per share)	8.44
Forfeited (in dollars per share)	11.06
Outstanding, ending (in dollars per share)	9.76	$ 9.47
Options exercisable (in dollars per share)	9.38
Vested and expected to vest (in dollars per share)	9.76
Weighted average grant date fair value
Outstanding, beginning (in dollars per share)	2.01
Cancelled (in dollars per share)	0.92
Forfeited (in dollars per share)	9.89
Outstanding, ending (in dollars per share)	2.33	$ 2.01
Options exercisable (in dollars per share)	1.95
Vested and expected to vest (in dollars per share)	$ 2.33
Weighted average remaining contractual term (years)
Outstanding, term	4 years 5 months 8 days	3 years 8 months 8 days
Options exercisable, term	4 years 4 months 6 days
Vested and expected to vest, term	4 years 5 months 8 days