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Long Term Debt - Interest Expense Related to Convertible Senior Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]        
Non-cash amortization of debt discount     $ 6,910 $ 190
1.50% Convertible Senior Notes        
Debt Instrument [Line Items]        
Coupon interest $ 1,875 $ 0 2,500 0
Non-cash amortization of debt discount 5,040 0 6,720 0
Amortization of deferred financing costs 622 0 829 0
Convertible senior notes interest expense $ 7,537 $ 0 $ 10,049 $ 0