STOCKHOLDERS' EQUITY - Activity in stockholders' equity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		514,003			514,003
Beginning Balance	$ 4,610	$ 6,351	$ 3,497	$ 5,279	$ 6,351	$ 5,279
Stock-based compensation	88	85	113	166
Issuance of common stock upon exercise of warrants, net		6
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes				(11)
Issuance of common stock for service				100
Issuance of common stock, net of issuance costs			1,210
Net loss	$ (1,584)	(1,832)	(1,993)	(2,037)	$ (3,416)	(4,030)
Ending Balance (in shares)	515,340				515,340
Ending Balance	$ 3,114	$ 4,610	$ 2,827	$ 3,497	$ 3,114	$ 2,827
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	514,463	514,003	17,563	6,748	514,003	6,748
Beginning Balance	$ 1	$ 1	$ 0	$ 0	$ 1	$ 0
Issuance of common stock upon exercise of warrants (in shares)		460		10,250
Issuance of common stock for fractional shares in the 10:1 reverse stock split (in shares)	877
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes (in shares)				111
Issuance of common stock for service (in shares)				454
Issuance of common stock, net of issuance costs (in shares)			7,143
Ending Balance (in shares)	515,340	514,463	24,706	17,563	515,340	24,706
Ending Balance	$ 1	$ 1	$ 0	$ 0	$ 1	$ 0
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	136,354	136,263	127,737	127,482	136,263	127,482
Stock-based compensation	88	85	113	166
Issuance of common stock upon exercise of warrants, net		6
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes				(11)
Issuance of common stock for service				100
Issuance of common stock, net of issuance costs			1,210
Ending Balance	136,442	136,354	129,060	127,737	136,442	129,060
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(131,745)	(129,913)	(124,240)	(122,203)	(129,913)	(122,203)
Net loss	(1,584)	(1,832)	(1,993)	(2,037)
Ending Balance	$ (133,329)	$ (131,745)	$ (126,233)	$ (124,240)	$ (133,329)	$ (126,233)