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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
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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 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 + Details
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