Convertible Senior Notes - Summary of Interest Expense (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]
Amortization of debt issuance costs and discount			$ 23,553	$ 10,949
Convertible Senior Notes \| Convertible senior notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,606	$ 1,005	4,818	1,580
Amortization of debt issuance costs and discount	7,992	5,436	23,552	10,949
Total	$ 9,598	$ 6,441	$ 28,370	$ 12,529

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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