Convertible Notes - Schedule of Convertible Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Net carrying amount of the liability component	$ 110,078	$ 141,211
2.50% Convertible notes due 2023 \| Unsecured obligations
Debt Instrument [Line Items]
Outstanding principal	125,500	171,500
Unamortized debt discount	(14,524)	(28,524)
Unamortized debt issuance	(898)	(1,765)
Net carrying amount of the liability component	$ 110,078	$ 141,211

Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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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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Amount, after accumulated amortization, of debt discount.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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