STOCKHOLDERS' EQUITY - Activity in stockholders' equity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		809,648			809,648
Beginning Balance	$ 3,497	$ 5,279	$ 7,927	$ 10,035	$ 5,279	$ 10,035
Stock-based compensation	113	166	205	221
Issuance of common stock upon exercise of warrants		0
Issuance of common stock for service (in shares)					54,466
Issuance of common stock for service		100	1	3
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes (in shares)					13,225
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes		(11)
Issuance of common stock, net of issuance costs	1,210
Net loss	$ (1,993)	(2,037)	(2,569)	(2,332)	$ (4,030)	(4,901)
Ending Balance (in shares)	2,964,485				2,964,485
Ending Balance	$ 2,827	$ 3,497	$ 5,564	$ 7,927	$ 2,827	$ 5,564
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	2,107,339	809,648	610,614	610,364	809,648	610,364
Beginning Balance	$ 2	$ 1	$ 1	$ 1	$ 1	$ 1
Issuance of common stock upon exercise of warrants (in shares)		1,230,000
Issuance of common stock upon exercise of warrants		$ 1
Issuance of common stock for service (in shares)		54,466	34	250
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes (in shares)		13,225
Issuance of common stock, net of issuance costs (in shares)	857,146
Issuance of common stock, net of issuance costs	$ 1
Ending Balance (in shares)	2,964,485	2,107,339	610,648	610,614	2,964,485	610,648
Ending Balance	$ 3	$ 2	$ 1	$ 1	$ 3	$ 1
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	127,735	127,481	122,766	122,542	127,481	122,542
Stock-based compensation	113	166	205	221
Issuance of common stock upon exercise of warrants		(1)
Issuance of common stock for service		100	1	3
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes		(11)
Issuance of common stock, net of issuance costs	1,209
Ending Balance	129,057	127,735	122,972	122,766	129,057	122,972
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(124,240)	(122,203)	(114,840)	(112,508)	(122,203)	(112,508)
Net loss	(1,993)	(2,037)	(2,569)	(2,332)
Ending Balance	$ (126,233)	$ (124,240)	$ (117,409)	$ (114,840)	$ (126,233)	$ (117,409)