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STOCKHOLDERS' EQUITY - Activity in stockholders' equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance (in shares)   5,223,015     5,223,015  
Beginning Balance $ 7,701 $ 9,568 $ 2,892 $ 2,511 $ 9,568 $ 2,511
Stock-based compensation 182 23 90 91    
Issuance of common stock, net of transaction costs   173 1,640 1,066    
Issuance of common stock upon exercise of warrants, net of transaction costs     3,971 889    
Net loss $ (1,832) (2,063) (1,616) (1,665) $ (3,895) (3,281)
Ending Balance (in shares) 5,303,426       5,303,426  
Ending Balance $ 6,051 $ 7,701 $ 6,977 $ 2,892 $ 6,051 $ 6,977
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance (in shares) 5,303,426 5,223,015 1,775,930 1,035,893 5,223,015 1,035,893
Beginning Balance $ 5 $ 5 $ 2 $ 1 $ 5 $ 1
Issuance of common stock, net of issuance costs (in shares)   80,411 489,341 365,319 80,411  
Issuance of common stock, net of transaction costs     $ 1      
Issuance of common stock upon exercise of warrants (in shares)     1,498,872 374,718    
Issuance of common stock upon exercise of warrants, net of transaction costs     $ 1 $ 1    
Ending Balance (in shares) 5,303,426 5,303,426 3,764,143 1,775,930 5,303,426 3,764,143
Ending Balance $ 5 $ 5 $ 4 $ 2 $ 5 $ 4
Additional Paid-In Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance 152,239 152,043 140,652 138,607 152,043 138,607
Stock-based compensation 182 23 90 91    
Issuance of common stock, net of transaction costs   173 1,639 1,066    
Issuance of common stock upon exercise of warrants, net of transaction costs     3,970 888    
Ending Balance 152,421 152,239 146,351 140,652 152,421 146,351
Accumulated Deficit            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance (144,543) (142,480) (137,762) (136,097) (142,480) (136,097)
Net loss (1,832) (2,063) (1,616) (1,665)    
Ending Balance $ (146,375) $ (144,543) $ (139,378) $ (137,762) $ (146,375) $ (139,378)