Convertible Senior Notes - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Amortization of debt issuance costs and discount	$ 7,675	$ 2,699
Convertible Senior Notes \| Convertible senior notes
Debt Instrument [Line Items]
Contractual interest expense	1,606	287
Amortization of debt issuance costs and discount	7,675	2,699
Total	$ 9,281	$ 2,986

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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