NET LOSS PER SHARE - Schedule of Net Loss Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2023	Dec. 31, 2022
Basic and diluted loss per share
Net loss attributable to common stockholders - basic	$ (19,639)	$ (20,552)	$ (51,012)	$ (17,307)	$ (17,307)
Net loss attributable to common stockholders - diluted	$ (19,639)	$ (20,552)	$ (51,012)	$ (17,307)	$ (17,307)
Net income per share attributable to common stockholders - basic (in dollars per share)	$ (0.55)	$ (0.15)	$ (0.43)	$ (0.49)	$ (0.49)
Net income per share attributable to common stockholders - diluted (in dollars per share)	$ (0.55)	$ (0.15)	$ (0.43)	$ (0.49)	$ (0.49)
Weighted-average common share outstanding - basic (in shares)	35,813	133,761	119,877	35,628	35,628
Weighted-average common share outstanding - diluted (in shares)	35,813	133,761	119,877	35,628	35,628