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RESEARCH COLLABORATION AGREEMENT AND LICENSE AGREEMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Research Collaboration Agreement and License Agreement (Textual)        
Research and development expenses $ 954 $ 1,860 $ 1,939 $ 3,274
Harvard License Agreement and Collaboration Agreement [Member]        
Research Collaboration Agreement and License Agreement (Textual)        
Total payment obligation     7,200  
Research and development expenses $ 202   $ 424  
Research collaboration agreement expire date     May 16, 2022