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Convertible Senior Notes - Interest Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt
Total interest expense	$ 1,165
Convertible senior notes
Debt
Contractual interest expense	943	$ 503
Amortization of debt discount		818
Amortization of debt issuance costs	222	65
Total interest expense	$ 1,165	$ 1,386

X

- Definition

The amount of contractual interest expense under debt instrument.

+ References

No definition available.

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- Definition

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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- Definition

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

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