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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value Measurements, Level 3 | 3.25% Convertible Senior Notes (due 2020)
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]
Convertible senior notes	$ (25,900)	$ (22,469)
Cash Equivalents | Fair Value Measurements, Level 1
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]
Assets measured at fair value on recurring basis	880	13,718
Carrying Amount | 3.25% Convertible Senior Notes (due 2020)
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]
Convertible senior notes	(25,900)	(22,469)
Carrying Amount | Cash Equivalents
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items]
Assets measured at fair value on recurring basis	$ 880	$ 13,718

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

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Fair value of financial and nonfinancial obligations.

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