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

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Fair Value Measurements - Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Feb. 12, 2019
Fair Value Measurements
Amount before unaccreted debt discount and unamortized debt issuance costs	$ 325,000	$ 325,000
Convertible Senior Subordinated Notes
Fair Value Measurements
Interest rate (as a percent)	1.75%		1.75%
Face value	$ 325,000		$ 325,000
Amount before unaccreted debt discount and unamortized debt issuance costs	325,000
Convertible Senior Subordinated Notes \| Carrying Value
Fair Value Measurements
Debt instrument	229,442
Convertible Senior Subordinated Notes \| Fair Value
Fair Value Measurements
Debt instrument	$ 322,667