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Convertible Senior Notes - Carrying Amount (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Jun. 11, 2020
Long-Term Debt
Carrying amount of Convertible Notes	$ 280,026	$ 189,416
2.75% Convertible Senior Notes due 2027
Long-Term Debt
Convertible Notes	287,500	287,500	$ 287,500
Less: Unamortized debt discount		(92,102)
Less: Unamortized debt issuance costs	(7,474)	(5,982)
Carrying amount of Convertible Notes	$ 280,026	$ 189,416

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- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Face (par) amount of debt instrument at time of issuance.

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

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