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Fair Value Measurements - Transfers (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Fair Value Measurements, Valuation
Amount of transfers of assets and liabilities measured on a recurring basis between Levels 1, 2 and 3 of the fair value hierarchy	$ 0	$ 0
2.75% Convertible Senior Notes due 2027
Fair Value Measurements, Valuation
Fair value of convertible senior notes	$ 341,800,000	$ 442,200,000

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- Definition

Amount of transfers of assets and liabilities measured on a recurring basis between Levels 1, 2 and 3 of the fair value hierarchy.

+ References

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- Definition

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+ References

No definition available.

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- Definition

Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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