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DEBT - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Disclosure [Abstract]        
Contractual interest expense $ 1,704 $ 1,764 $ 5,122 $ 5,861
Amortization of debt issuance costs 666 629 1,976 1,512
Amortization of debt discount 5,844 5,430 17,245 12,684
Capitalized interest and other (Note 5) (881) (691) (3,016) (1,448)
Total $ 7,333 $ 7,132 $ 21,327 $ 18,609
Effective interest rate on convertible senior notes 6.70% 6.78% 6.70% 7.35%