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Fair Value Measurements - Fair value hierarchy (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Contingent consideration    
Fair Value Measurements    
Liabilities $ 7,800 $ 9,600
Recurring    
Fair Value Measurements    
Assets 386,154 415,775
Liabilities 377,664 388,142
Recurring | Mutual funds    
Fair Value Measurements    
Assets 100,059 101,085
Recurring | U.S. Treasury notes    
Fair Value Measurements    
Assets 126,181 136,665
Recurring | Corporate debt securities    
Fair Value Measurements    
Assets 154,444 172,658
Recurring | Convertible Senior Notes    
Fair Value Measurements    
Liabilities 369,909 378,553
Recurring | Contingent consideration    
Fair Value Measurements    
Liabilities 7,755 9,589
Recurring | Money market mutual fund    
Fair Value Measurements    
Assets 5,470 5,367
Recurring | Level 1    
Fair Value Measurements    
Assets 386,154 415,775
Recurring | Level 1 | Mutual funds    
Fair Value Measurements    
Assets 100,059 101,085
Recurring | Level 1 | U.S. Treasury notes    
Fair Value Measurements    
Assets 126,181 136,665
Recurring | Level 1 | Corporate debt securities    
Fair Value Measurements    
Assets 154,444 172,658
Recurring | Level 1 | Money market mutual fund    
Fair Value Measurements    
Assets 5,470 5,367
Recurring | Level 2    
Fair Value Measurements    
Liabilities 369,909 378,553
Recurring | Level 2 | Convertible Senior Notes    
Fair Value Measurements    
Liabilities 369,909 378,553
Recurring | Level 3    
Fair Value Measurements    
Liabilities 7,755 9,589
Recurring | Level 3 | Contingent consideration    
Fair Value Measurements    
Liabilities $ 7,755 $ 9,589