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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - 3.25% Convertible Senior Notes (due 2020) - Fair Value Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Level 1
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]
Convertible senior notes	$ 0	$ 0
Level 2
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]
Convertible senior notes	0	0
Level 3
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]
Convertible senior notes	30,503	27,974
Carrying Amount
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]
Convertible senior notes	$ 30,503	$ 27,974

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- Definition

Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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