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FINANCING ARRANGEMENTS - Schedule of Convertible Debt Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Apr. 04, 2016
Debt Disclosure [Abstract]          
Stated interest rate         3.25%
Contractual interest (3.25% of the principal amount per annum) $ 2,032 $ 2,032 $ 6,096 $ 6,096  
Amortization of debt discount 3,701 3,341 10,824 9,772  
Total $ 5,733 $ 5,373 $ 16,920 $ 15,868