Fair Value Measurements - Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Feb. 12, 2019
Fair Value Measurements
Amount before unaccreted debt discount and unamortized debt issuance costs	$ 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	223,202
Convertible Senior Subordinated Notes \| Fair Value
Fair Value Measurements
Debt instrument	$ 353,909

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
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- Definition

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

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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.

+ References

No definition available.

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