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FAIR VALUE MEASUREMENTS - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
business
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 10, 2018
Business Acquisition [Line Items]                    
Number of businesses acquired | business         2          
Fair value of convertible debt $ 230,900       $ 230,900          
Changes in the fair value of contingent consideration 5,085 $ (702)     7,448 $ 5,820        
Adjustments to contingent consideration         (10,268) (4,329) $ 1,000 $ (5,700) $ (2,300)  
Write off of L-UDCA contingent consideration $ 0 $ 0   $ 18,000 $ 0 18,000        
Product Rights Bile Acid Products                    
Business Acquisition [Line Items]                    
Adjustments to contingent consideration           $ 5,800        
Acquired Product Rights L-UDCA                    
Business Acquisition [Line Items]                    
Write off of L-UDCA contingent consideration     $ 18,000              
Senior Notes | Senior Notes Due 2025                    
Business Acquisition [Line Items]                    
Interest rate percentage 2.50%       2.50%         2.50%