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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Cash and cash equivalents |  |  |
Marketable securities |  | 472,911 | $ 256,636
Contingent consideration |  |  | 30,800
Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Cash and cash equivalents |  | 495,107 | 926,752
Marketable securities |  | 499,228 | 277,827
Derivative assets |  | 34 | 79
Contingent consideration |  | 26,847 | 70,543
Derivative liabilities |  | 324 | 514
Convertible debt | [1] | 387,243 | 379,981
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Cash and cash equivalents |  | 495,107 | 926,752
Marketable securities |  | 499,228 | 277,827
Derivative assets |  | 34 | 79
Contingent consideration |  | 26,847 | 70,543
Derivative liabilities |  | 324 | 514
Convertible debt | [1] | $ 747,213 | $ 547,113
[1] | The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note, which includes the equity conversion features.

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