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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Nov. 13, 2019
Dec. 31, 2018
Apr. 25, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions        
Marketable securities $ 216,021   $ 256,636  
Contingent consideration 9,100 $ 24,000   $ 30,800
Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions        
Cash and cash equivalents 773,924   926,752  
Marketable securities 241,793   277,827  
Derivative assets 528   79  
Contingent consideration 39,705   70,543  
Derivative liabilities 203   514  
Convertible debt [1] 394,687   379,981  
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions        
Cash and cash equivalents 773,924   926,752  
Marketable securities 241,793   277,827  
Derivative assets 528   79  
Contingent consideration 39,705   70,543  
Derivative liabilities 203   514  
Convertible debt [1] $ 1,010,275   $ 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.