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FUTURE ACQUISITION RIGHT AND JOINT DEVELOPMENT AGREEMENT (Details) - USD ($)
$ in Thousands
1 Months Ended
Aug. 31, 2019
Jan. 31, 2018
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2016
Variable Interest Entity [Line Items]          
Business combination-related contingent consideration     $ 68,600 $ 70,900 $ 25,000
Investment     $ 15,000    
Impairment of long-term investment $ 15,000        
Censa Pharmaceuticals Inc.          
Variable Interest Entity [Line Items]          
Payments for the option to acquire business   $ 10,000      
Business combination-related contingent consideration   19,900      
Censa Pharmaceuticals, Inc, Equity Holders          
Variable Interest Entity [Line Items]          
Additional required payments for the option to acquire business, successful development milestones   $ 5,000