STOCKHOLDERS' EQUITY - Activity in stockholder s' equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Apr. 12, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	809,648
Beginning Balance	$ 5,279	$ 10,035
Stock-based compensation	166	221
Issuance of common stock upon exercise of warrants	0
Issuance of common stock for service	100	3
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes	(11)
Net loss	$ (2,037)	(2,332)
Ending Balance (in shares)	2,107,339
Ending Balance	$ 3,497	$ 7,927
Subsequent Event | Series C, Registered Direct Offering
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock sold, price per share (in dollars per share)			$ 1.75
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	809,648	610,364
Beginning Balance	$ 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	250
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes (in shares)	13,225
Ending Balance (in shares)	2,107,339	610,614
Ending Balance	$ 2	$ 1
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	127,481	122,542
Stock-based compensation	166	221
Issuance of common stock upon exercise of warrants	(1)
Issuance of common stock for service	100	3
Issuance of shares pursuant to the vesting of restricted stock units, net of shares withheld for taxes	(11)
Ending Balance	127,735	122,766
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(122,203)	(112,508)
Net loss	(2,037)	(2,332)
Ending Balance	$ (124,240)	$ (114,840)