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RELATED PARTY TRANSACTIONS - Additional information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 14, 2017
Sep. 14, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jan. 01, 2019
Term of consulting agreement (in years) 3 years              
Terms of award   The granted stock options vest in 12 quarterly installments (with 1/12th of the option shares having vested on the date of grant).            
Stock-based compensation expense         $ 19,949 $ 12,272    
Retained earnings     $ (703,225)   (703,225)   $ (570,612) $ 300
Consulting Agreement                
Stock-based compensation expense     $ 100 $ 100 $ 200 $ 200    
Board of Directors Chairman                
Shares authorized 150,000 150,000            
Granted   $ 7.30