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Financial Instrument (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Assets    
Cash and cash equivalents $ 310,445 $ 460,725
Total investments 588,706 583,675
Short-term restricted cash 300 500
Long-term restricted cash 2,922 4,592
Total assets measured at fair value 902,373 1,049,492
Liabilities    
Fair value of contingent consideration 163,216 169,717
Total liabilities measured at fair value 163,216 169,717
Commercial paper, not included with cash and cash equivalents [Member]    
Assets    
Total investments 120,495 187,632
Corporate debt securities [Member]    
Assets    
Total investments 46,810 8,968
U.S. government & agency securities, not included with cash and cash equivalents [Member]    
Assets    
Total investments 421,401 387,075
Level 1 [Member]    
Assets    
Cash and cash equivalents 102,612 327,315
Short-term restricted cash 300 500
Long-term restricted cash 2,922 4,592
Total assets measured at fair value 105,834 332,407
Level 2 [Member]    
Assets    
Cash and cash equivalents 207,833 133,410
Total investments 588,706 583,675
Total assets measured at fair value 796,539 717,085
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member]    
Assets    
Total investments 120,495 187,632
Level 2 [Member] | Corporate debt securities [Member]    
Assets    
Total investments 46,810 8,968
Level 2 [Member] | U.S. government & agency securities, not included with cash and cash equivalents [Member]    
Assets    
Total investments 421,401 387,075
Level 3 [Member]    
Liabilities    
Fair value of contingent consideration 163,216 169,717
Total liabilities measured at fair value $ 163,216 $ 169,717