Convertible Senior Notes - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Amortization of debt issuance costs and discount			$ 15,560	$ 5,513
Convertible Senior Notes \| Convertible senior notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,606	$ 288	3,212	575
Amortization of debt issuance costs and discount	7,885	2,814	15,560	5,513
Total	$ 9,491	$ 3,102	$ 18,772	$ 6,088

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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