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FAIR VALUE MEASUREMENTS - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
business
Jun. 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 $ 225,900     $ 225,900          
Changes in the fair value of contingent consideration 4,286 $ 3,353   2,363 $ 6,522        
Adjustments to contingent consideration       (8,674) (2,767) $ 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         $ 6,500        
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%