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Indebtedness - Schedule of Interest Expense Recognized (Details) - 2027 Notes - 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]
Contractual interest expense	$ 2,500	$ 0	$ 3,639	$ 0
Amortization of debt discount	7	0	10	0
Amortization of debt issuance cost	1,436	0	2,078	0
Total interest expense related to the 2027 Notes	$ 3,943	$ 0	$ 5,727	$ 0

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to 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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