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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 13, 2019 | Apr. 25, 2018
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |  |
Marketable securities |  | $ 610,840 | $ 216,021 |  |
Contingent consideration |  |  | 8,900 | $ 24,000 | $ 30,800
Carrying Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |  |
Cash and cash equivalents |  | 914,121 | 773,924 |  |
Marketable securities |  | 640,260 | 241,793 |  |
Derivative assets |  | 95 | 528 |  |
Contingent consideration |  | 7,227 | 39,705 |  |
Derivative liabilities |  | 504 | 203 |  |
Convertible debt | [1] | 410,111 | 394,687 |  |
Fair Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |  |
Cash and cash equivalents |  | 914,121 | 773,924 |  |
Marketable securities |  | 640,260 | 241,793 |  |
Derivative assets |  | 95 | 528 |  |
Contingent consideration |  | 7,227 | 39,705 |  |
Derivative liabilities |  | 504 | 203 |  |
Convertible debt | [1] | $ 1,739,553 | $ 1,010,275 |  |
[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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