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Financial Instrument (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets    
Total cash and cash equivalents $ 428,574 $ 460,725
Total investments 534,201 583,675
Short-term restricted cash: Cash 500 500
Long-term restricted cash: Cash 4,982 4,592
Total assets measured at fair value 968,257 1,049,492
Liabilities    
Fair value of contingent consideration 168,654 169,717
Total liabilities measured at fair value 168,654 169,717
Cash and money market funds [Member]    
Assets    
Total cash and cash equivalents 227,251 327,315
Commercial paper [Member]    
Assets    
Total cash and cash equivalents 143,958 133,185
U.S. government and agency securities [Member]    
Assets    
Total cash and cash equivalents 32,377 225
U.S. Treasury security [Member]    
Assets    
Total cash and cash equivalents 24,988  
Commercial paper, not included with cash and cash equivalents [Member]    
Assets    
Total investments 141,976 187,632
Corporate debt securities [Member]    
Assets    
Total investments 5,313 8,968
U.S. government & agency securities, not included with cash and cash equivalents [Member]    
Assets    
Total investments 386,912 387,075
Level 1 [Member]    
Assets    
Total cash and cash equivalents 227,251 327,315
Short-term restricted cash: Cash 500 500
Long-term restricted cash: Cash 4,982 4,592
Total assets measured at fair value 232,733 332,407
Level 1 [Member] | Cash and money market funds [Member]    
Assets    
Total cash and cash equivalents 227,251 327,315
Level 2 [Member]    
Assets    
Total cash and cash equivalents 201,323 133,410
Total investments 534,201 583,675
Total assets measured at fair value 735,524 717,085
Level 2 [Member] | Commercial paper [Member]    
Assets    
Total cash and cash equivalents 143,958 133,185
Level 2 [Member] | U.S. government and agency securities [Member]    
Assets    
Total cash and cash equivalents 32,377 225
Level 2 [Member] | U.S. Treasury security [Member]    
Assets    
Total cash and cash equivalents 24,988  
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member]    
Assets    
Total investments 141,976 187,632
Level 2 [Member] | Corporate debt securities [Member]    
Assets    
Total investments 5,313 8,968
Level 2 [Member] | U.S. government & agency securities, not included with cash and cash equivalents [Member]    
Assets    
Total investments 386,912 387,075
Level 3 [Member]    
Liabilities    
Fair value of contingent consideration 168,654 169,717
Total liabilities measured at fair value $ 168,654 $ 169,717