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STOCKHOLDERS' EQUITY - Activity in stockholders' equity (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Mar. 31, 2024
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance (in shares) | shares   1,035,893     1,035,893  
Beginning Balance $ 2,892 $ 2,511 $ 4,610 $ 6,351 $ 2,511 $ 6,351
Stock-based compensation 90 91 88 85    
Issuance of common stock, net $ 1,640 1,066        
Issuance of common stock upon exercise of warrants (in shares) | shares 40,000          
Issuance of common stock upon exercise of warrants, net $ 3,971 889   6    
Net loss $ (1,616) (1,665) (1,584) (1,832) $ (3,281) (3,416)
Ending Balance (in shares) | shares 3,764,143       3,764,143  
Ending Balance $ 6,977 $ 2,892 $ 3,114 $ 4,610 $ 6,977 $ 3,114
Stock split, conversion ratio     0.10      
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance (in shares) | shares 1,775,930 1,035,893 514,463 514,003 1,035,893 514,003
Beginning Balance $ 2 $ 1 $ 1 $ 1 $ 1 $ 1
Issuance of common stock, net of issuance costs (in shares) | shares 489,341 365,319     854,660  
Issuance of common stock, net $ 1          
Issuance of common stock upon exercise of warrants (in shares) | shares 1,498,872 374,718   460    
Issuance of common stock upon exercise of warrants, net $ 1 $ 1        
Issuance of common stock for fractional shares in the 10:1 reverse stock split (in shares) | shares 877          
Ending Balance (in shares) | shares 3,764,143 1,775,930 515,340 514,463 3,764,143 515,340
Ending Balance $ 4 $ 2 $ 1 $ 1 $ 4 $ 1
Additional Paid-In Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance 140,652 138,607 136,354 136,263 138,607 136,263
Stock-based compensation 90 91 88 85    
Issuance of common stock, net 1,639 1,066        
Issuance of common stock upon exercise of warrants, net 3,970 888   6    
Ending Balance 146,351 140,652 136,442 136,354 146,351 136,442
Accumulated Deficit            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance (137,762) (136,097) (131,745) (129,913) (136,097) (129,913)
Net loss (1,616) (1,665) (1,584) (1,832)    
Ending Balance $ (139,378) $ (137,762) $ (133,329) $ (131,745) $ (139,378) $ (133,329)