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Debt - Summary of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Amortization of debt discount	$ 11,214	$ 11,615	$ 5,456
Convertible Note Due 2023 | Senior Notes
Short-term Debt [Line Items]
Contractual interest expense	6,325	6,325	2,302,000
Amortization of debt discount	9,083	8,606	3,018,000
Total	$ 15,408	$ 14,931	$ 5,320,000
Effective interest rate	5.45%

X

- Definition

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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