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FAIR VALUE MEASUREMENTS - Vallon - Q1 - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
May 17, 2022
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jul. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]          
Warrant exercise price (in usd per share) $ 0.9382       $ 0.01
Warrant liability   $ 18   $ 0  
GRI Bio, Inc. (Formerly Vallon Pharmaceuticals, Inc.)          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Sale of stock (in shares) 123,333        
Sale of stock, price per share (in usd per share) $ 31.896        
Warrant exercise price (in usd per share) $ 28.146        
Warrant liability   $ 185 $ 185 $ 122  
GRI Bio, Inc. (Formerly Vallon Pharmaceuticals, Inc.) | Common Stock          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Warrants issued (in shares) 123,333