BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- Basis of presentation (Details) $ / shares in Units, $ in Thousands			3 Months Ended		12 Months Ended
	Jun. 16, 2023	Jun. 15, 2023	Mar. 31, 2024 USD ($) $ / shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Revenue from External Customer [Line Items]
Net loss			$ (418)	$ (1,333)	$ 4,300
Cash used in operating activities			(58)	(1,183)	2,400
Stockholders' equity			3,225	$ 2,955	$ 3,051	$ (477)
Reverse stock split ratio	0.142857	0.142857
Minimum
Revenue from External Customer [Line Items]
Stockholders' equity			$ 2,500
Common stock, minimum bid price (in dollars per share) | $ / shares			$ 1.00
Reverse stock split ratio		0.5