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FINANCING ARRANGEMENTS - Schedule of Convertible Debt Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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 $ 4,064 $ 4,064  
Amortization of debt discount 3,607 3,256 7,123 6,431  
Total $ 5,639 $ 5,288 $ 11,187 $ 10,495