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SHARE-BASED COMPENSATION, SHARE-BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Stock options                
Stock-based compensation (in dollars) $ 17 $ 95 $ 73 $ 147        
Expected term     10 years          
Vesting period     48 months          
Cumulative Adjustment on adoption of ASU 2016-09. 12,814 23,310 $ 12,814 23,310 $ 15,516 $ 18,115 $ 25,524 $ 19,186
Research and development                
Stock options                
Stock-based compensation (in dollars) (17) 6 (11) 9        
General and administrative                
Stock options                
Stock-based compensation (in dollars) 34 89 84 138        
Stock Options                
Stock options                
Stock-based compensation (in dollars) $ 29 $ 70 $ 77 $ 98