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RESEARCH COLLABORATION AGREEMENT AND LICENSE AGREEMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Research Collaboration Agreement and License Agreement (Textual)      
Research and development expenses $ 3,459 $ 5,348 $ 7,349
License Agreement and Collaboration Agreement [Member]      
Research Collaboration Agreement and License Agreement (Textual)      
Total payment obligation 7,200    
Research and development expenses $ 800 $ 1,600 $ 900
Research collaboration agreement expire date Feb. 16, 2023