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Convertible Senior Notes - Summary of Convertible Debt (Details) - 1.125% Convertible Senior Notes Due 2026 - Convertible debt - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal	$ 345,000	$ 345,000
Unamortized discount	(43,255)	(49,346)
Unamortized issuance costs	(5,404)	(6,164)
Net carrying amount	296,341	289,490
Equity component, net of purchase discounts and issuance costs	$ 58,560	$ 58,560

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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.

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